The ultimate question in this case presents significant issues about a state government’s ability to allocate insurance benefits by creating distinctions between different classes of individuals. Valjeanne Currie appeals the district court’s entry of summary judgment for the defendant, the Group Insurance Commission (GIC), which provides disability benefits for employees of the state of Massachusetts. Currie v. Group Ins. Comm’n, 147 F.Supp.2d 30 (D.Mass.2001). Currie challenges an aspect of the GIC long-term disability benefits policy, which limits benefits for noninstitutionalized individuals with mental disabilities to one year; GIC imposes no such time limit on benefits for the institutionalized mentally ill or on non-institutionalized individuals with physical disabilities. Currie argues that this policy violates the Americans with Disabilities Act (ADA), 42 U.S.C. §§ 12101-12213 (1994), the Equal Protection Clause of the United States Constitution, and the Due Process Clause of the United States Constitution.
The immediate issue is whether this court should proceed to resolve the merits of this case while an appeal proceeds in parallel litigation in the state courts on an issue of state law which could moot or otherwise inform the federal litigation. The plaintiffs have asked us to stay our hand. The defendants urge us to dispose of the case on a difficult issue of federal statutory construction on which the circuits are split. They generally would prefer a prompter disposition of the federal action, but agree that the state court should decide state law issues. There is then the issue of what form a stay should take, should we decide to stay. The alternatives proposed are, a stay under Colorado River Conservation District v. United States, 424 U.S. 800, 96 S.Ct. 1236, 47 L.Ed.2d 483 (1976), or certification of the state law question to the Massachusetts Supreme Judicial Court (SJC). In the interest of comity, we elect to stay on Colorado River grounds. Certification would interrupt the normal state appellate processes. Moreover, it would put the decisions of the state law issue directly to the state’s highest court on a record developed to address federal, not state, issues. Finally, it is unclear whether the SJC would accept certification where, as here, the state court’s decision on state issues would not be dispositive of the federal issue, but would merely render it moot.
I.
Valjeanne Currie was a Massachusetts state employee for fourteen years, working at the Massachusetts Mental Health Center. She suffers from schizophrenia. In 1999, her illness forced her to take a leave of absence from work and she has not been able to return to work since that time. She receives daily psychiatric care on an *4outpatient basis. There is no dispute in this case that Currie’s illness is severe, genuine, and debilitating.
The GIC is a state agency, established by state law, to provide state employees with medical, dental, life, and disability insurance. Mass. Gen. Laws ch. 32A, §§ 1-4, 10D (2000). The long-term disability insurance (LTD) program, which is the policy Currie challenges, provides income assistance to state employees who become disabled and cannot work. The governing statute charges the GIC with establishing a disability insurance plan “on such terms and conditions as it deems to be in the best interest of the commonwealth and its employees.” Id. § 10D. The plan is required to be self-supporting; by statute, the Commonwealth may make no contribution to the support of the plan. Id. The plan is also voluntary — state employees may choose whether or not they wish to participate. Participating employees pay premiums during the course of their employment. Massachusetts state employees are not permitted to participate in the federal social security system, and so Currie does not have access to the federally sponsored social security net available to most Americans.
The Commonwealth initiated the LTD plan in 1988. The GIC accepts bids from private insurers to cover the LTD plan. Prior to 1998, the plan did not provide any benefits for mentally disabled individuals who were not hospitalized. In 1994, the Hartford Life Insurance Company, the private insurer carrying the LTD contract, suggested adding coverage for nonhospi-talized mentally disabled individuals. However, after some consideration, the GIC determined that the rate increase required for such coverage was infeasible due to the risk of adverse selection. Adverse selection is a problem confronted by voluntary insurance plans, whereby those individuals who consider themselves to have a low risk opt out of the program. This decreases the amount paid into the program, and increases the percentage of program participants who will eventually receive benefits. Of course, as the cost of coverage rises, more low-risk individuals will choose to opt out.
When the Hartford contract was renewed, effective July 1998, the GIC’s outside consultants recommended that the new contract provide for one year’s worth of benefits for nonhospitalized mentally disabled individuals. The GIC adopted this recommendation, which is the policy challenged by Currie. After this first year of benefits, the individual may only continue to receive benefits if he or she is confined to a hospital or institution, in which case the benefits continue until the individual is discharged. Plan participants who suffer from physical disabilities have no such limitations on their coverage.
Currie began receiving benefits in June of 1999. In October of that year, she received a letter informing her that the payments would be terminated in June of 2000. unless she entered an institution. In January of 2000, Currie filed suit against the GIC in the federal district court. In May of 2000, Currie filed suit in state court, challenging the same provision of the LTD policy based on Massachusetts state antidiscrimination law, Mass. Gen. Laws ch. 151B (2000). On June 7, 2000, a state superior court judge entered a preliminary injunction, ordering GIC to continue her benefits, and thus necessarily finding some probability of success. Currie v. Hartford Life Ins. Co., No. 00-1831 (Mass.Super. Ct. June 7, 2000). On June 14, 2001, the federal district court denied summary judgment for the plaintiffs and granted summary judgment to the defendants. On January 24, 2002, a state Superior Court judge denied plaintiffs motion *5for summary judgment, granted defendant’s motion for summary judgment, and dismissed the case. Currie v. Hartford Life Ins. Co., No. 00-1831-H (Mass.Super.Ct. Jan. 24, 2002). We cannot tell if the record in the state court case is fuller than or identical to the summary judgment record in the federal case. We can say the issues in the state and federal cases are not identical and therefore the evidence presented may be different. Plaintiffs have appealed that decision.
Currie argues that entering an institution would severely decrease the likelihood that her condition would improve to the extent that she would be able to return to work, and has presented affidavits from her treating doctors to support this argument. She implies that GIC’s policy, which allows for unlimited benefits for the hospitalized mentally ill, may therefore cost it more in the long run than would a policy allowing her to continue outpatient treatment. What is at stake, then, she argues, is not the amount of money GIC will pay out, but rather her ability to continue in a noninstitutionalized setting.1
Following oral argument in this case, the GIC informed us that it has negotiated a new LTD policy contract which will take effect when the current contract with the Hartford expires in July 2002. The new policy, carried by C.N.A. Group Benefits, will provide LTD benefits beyond one year for individuals, like Currie, who have mental disabilities and are receiving outpatient care in the form of day treatment, partial hospital treatment, or residential treatment for at least five hours per day, four days per week. Because this new policy will not apply to Currie or to other individuals who stop working before the new policy comes into effect in July 2002, GIC does not suggest that this change moots Currie’s claim.
II.
Currie makes three challenges to the LTD policy offered by GIC through the Hartford, one premised on the ADA and two premised on the federal constitution.
A. ADA Claim
First, Currie argues that the LTD policy violates Title II of the Americans with Disabilities Act, 42 U.S.C. §§ 12131-12165, which states that “no qualified individual with a disability shall, by reason of such disability, be excluded from participation in or be denied the benefits of the services, programs, or activities of a public entity, or be subjected to discrimination by any such entity.” Id. § 12132. The district court granted summary judgment to the defendant on this claim, holding that: 1) Title II of the ADA does not encompass employment practices; and 2) even if Title II covered employment, the LTD plan would fall under the “safe harbor” provision established by Congress for certain state insurance programs, id. § 12201(c). In its safe harbor ruling, the district court stated that because there was a rational basis for the distinction in benefits, the classification did not violate the state anti-discrimination statute. The court made no ruling on whether the classification violated the state constitution. Currie, 147 F.Supp.2d at 33-38. The GIC agrees with both of the district court’s conclusions. Neither question is easily decided.
*6 1. Title II coverage
The question of whether challenges to employment practices are cognizable under Title II has been considered by two of our sister circuits, and by several trial courts within this circuit, with divergent results. See Zimmerman v. Or. Dep’t of Justice, 170 F.3d 1169, 1173-74 (9th Cir.1999) (not cognizable), cert. denied, 531 U.S. 1189, 121 S.Ct. 1186, 149 L.Ed.2d 103 (2001); Bledsoe v. Palm Beach County Soil & Water Conservation Dist., 133 F.3d 816, 820-22 (11th Cir.1998) (cognizable); Downs v. Mass. Bay Transp. Auth., 13 F.Supp.2d 130, 134-36 (D.Mass.1998) (cognizable); Motzkin v. Trs. of Boston Unin, 938 F.Supp. 983, 996 (D.Mass.1996) (not cognizable); see also McKibben v. Hamilton County, 215 F.3d 1327 (6th Cir.2000) (per curiam) (unpublished table decision) (noting split, but proceeding on merits where coverage not challenged by defendant). Title I of the ADA, 42 U.S.C. §§ 12112-12117 (1994), expressly covers the employment practices of both private and public entities.2 Id. § 12112.
The district court believed that the clear language of Title I indicated that Title I was the sole avenue for bringing employment claims, and that the clear language of Title II indicated that Title II was limited to so-called “outputs” of a public agency. Currie, 147 F.Supp.2d at 34-35. Specifically, the court found that the second clause of Title II, which mandates that qualified individuals not “be subjected to discrimination by any [public] entity” was not intended to expand the scope of coverage beyond “services, programs, or activities” (articulated in the previous clause), but simply to clarify that Title II prohibits both intentional discrimination (through the “subjected to discrimination” clause) and disparate treatment (through the “excluded from participation in or ... denied the benefits of’ clause). Id. at 34-36 (analyzing 42 U.S.C. § 12132). The court supported its clear language analysis by finding that the overall structure of the ADA, which provides a remedy for employment discrimination under Title I, supported its conclusion. Id. at 36.
The answer is not so plain. While Title I’s language clearly covers employment discrimination, and public employers are not exempted from the definition of a covered entity, Title I says nothing about it being an exclusive remedy or avenue for suit. 42 U.S.C. § 12112. It is not unheard of for individuals to have overlapping rights, even within one Act.3 Here, the two Titles grant substantively different rights—for instance, while Title I gives successful plaintiffs the opportunity to obtain compensatory and punitive damages, there is no such right under Title II. Id. § 12133 (referencing 29 U.S.C. § 794a). Nor is the language of Title II clear on this question. The words “public services, programs, or activities” do not *7necessarily exclude employment,4 and the “subjected to discrimination” clause may broaden the scope of coverage further. Moreover, the Department of Justice has promulgated a regulation stating that Title II does cover employment practices. 28 C.F.R. § 35.140 (2001); see also 28 C.F.R. pt. 35, App. A (2001) (elaborating on § 35.140). This regulation is entitled to deference under the Chevron doctrine if the statutory language is unclear. Chevron U.S.A, Inc. v. Natural Res. Def. Council, Inc., 467 U.S. 837, 842-43, 104 S.Ct. 2778, 81 L.Ed.2d 694 (1984). In addition, Currie cites to legislative history which she says demonstrates that Congress intended Title II to cover employment and to function in the same manner as Section 504 of the Rehabilitation Act.
2. Safe Harbor
Even beyond the difficult statutory interpretation question of whether Title II covers employment, there is a second complicated statutory question — whether the “safe harbor” provision of the ADA, 42 U.S.C. § 12201(c)(2), immunizes the LTD. The safe harbor provision states that the ADA shall not be construed as prohibiting a covered organization “from establishing, sponsoring, observing or administering the terms of a bona fide benefit plan that are based on underwriting risks, classifying risks, or administering such risks that are based on or not inconsistent with State law.” Id.
Currie argues that the safe harbor provision does not apply to the challenged aspect of the LTD plan because the hospitalization requirement is not based on any actual data. She cites the legislative history and the regulations as support for the proposition that a risk-based defense must be based on “sound actuarial data and not on speculation.” See 28 C.F.R. pt. 36, App. B., at 676 (2001) (internal quotation marks omitted) (citing legislative history and discussing 28 C.F.R. § 36.212 (2000)).
The GIC responds that the safe harbor does not require it to conduct actuarial studies to support its policies. See Rogers v. Dept. of Health & Envtl. Control, 174 F.3d 431, 437 (4th Cir.1999) (actuarial data not required for safe harbor); Ford v. Schering-Plough Corp., 145 F.3d 601, 611 (3d Cir.1998) (insurance company need not justify its policy coverage after a plaintiffs mere prima facie allegation). Instead, the GIC asserts, the policy need only be based on “actual or reasonably anticipated experience,” a standard used by some district courts and also articulated in the legislative history. See Currie, 147 F.Supp.2d at 37; Chabner v. United of Omaha Life Ins. Co., 994 F.Supp. 1185 (N.D.Cal.1998), aff'd on other grounds, 225 F.3d 1042 (9th Cir.2000); Doukas v. Metro. Life Ins. Co., 950 F.Supp. 422, 428-29 (D.N.H.1996) (citing H.R. Rep. 485(11), at 135-48, reprinted in 1990 U.S.C.C.A.N. 303, 418-21). The GIC has presented evidence that it says supports its policy under this standard. This evidence includes the fact that the industry standard is to impose a durational limit on disability benefits; evidence that under the University of Maine’s LTD plan, which is *8an employer-paid LTD covering all employees, 25% of recipients are mentally disabled; evidence that the costs associated with generous disability benefits offered by the University of Massachusetts’s LTD plan had led the insurer to cancel the contract; evidence that adverse selection had been a problem in GIC’s Indemnity Health Insurance plan; and an affidavit from a principal with the consulting company that the GIC retained to help it evaluate benefits stating that, in the principal’s opinion, no insurance company would agree to underwrite a voluntary, employee pay-all LTD plan that offered unlimited mental disability benefits.
Currie, however, argues that there is a second problem with the application of the safe harbor provision. The safe harbor provision applies only to risk-based policies that are “based on or not inconsistent with State law,” 42 U.S.C. § 12201(c)(2). She argues that the LTD policy is inconsistent with the Massachusetts Constitution and the state antidiscrimination law, Mass. Gen. Laws, ch. 151B, which prohibits employers from discriminating on the basis of handicap. Thus, we arrive at the questions that are currently pending before the state courts.
B. Federal Constitutional Claims
Currie also claims that the GIC’s use of the Hartford policy violates her federal constitutional rights to equal protection and due process of law.
Currie faces a difficult test under the equal protection clause. Currie does not contest the district court’s holding that the policy will survive equal protection scrutiny if it is rationally related to a legitimate governmental purpose.5 In its brief, the GIC asserts three possible justifications for the policy: 1) hospitalization serves as a proxy for determining those with the greatest need, i.e., those with the longest or most severe disability; 2) hospitalization serves as a proxy for verifying total disability; and 3) some limitation is necessary to keep costs at a viable level.6 Currie’s response boils down to two main points: 1) that none of these rationales explain why mental disability should be treated differently than other disabilities, such as muscular-skeletal disorders, that are common and difficult to verify, and the distinction is therefore arbitrary; and 2) that the policy will eventually cost the GIC more, because it undermines beneficiaries’ attempts to return to work, and therefore is not rationally related to cost concerns.
Currie’s due process claim rests on the theory that the policy impermissibly denies her a government benefit on a basis that infringes her constitutionally protected interest (namely, her right to liberty of person). See, e.g., Perry v. Sindermann, 408 U.S. 593, 597, 92 S.Ct. 2694, 33 L.Ed.2d 570 (1972) (holding that it would *9be impermissible for government to deny renewal of employment contract based on employee’s exercise of free speech rights). A state policy that has the effect of penalizing the exercise of a fundamental right must be justified by a compelling state interest in order to survive constitutional scrutiny. Shapiro v. Thompson, 394 U.S. 618, 634-38, 89 S.Ct. 1322, 22 L.Ed.2d 600 (1969) (administrative reasons for denying welfare benefits to recent interstate immigrants not compelling), overruled, in part on different grounds by Edelman v. Jordan, 415 U.S. 651, 94 S.Ct. 1347, 39 L.Ed.2d 662 (1974).
As explained below, we decline to decide any of Currie’s federal claims at this juncture, due to the pendency of the state court proceedings.
III.
Before oral argument in this case, Currie filed a motion with this court requesting a stay in these proceedings, pending the outcome of the state court proceedings.7 Currie suggested that a stay would save this court from having to decide the federal statutory and constitutional issues, particularly the ADA safe harbor question, which is intertwined with the state law question currently under consideration in the state court system. The GIC opposed this motion, arguing that we could affirm summary judgment on the merits by deciding that Title II of the ADA does not cover employment practices, or by deciding that the “contrary to state law” exception to the safe harbor applies only to matters of state insurance law. Of course, if the highest state court were to determine the plan violates state antidis-crimination law or the Massachusetts Constitution, both questions would most likely be moot, as the GIC would necessarily have to change the plan.
Generally speaking, “in cases where the relief being sought is equitable in nature or otherwise discretionary, federal courts not only have the power to stay the action based on abstention principles, but can also, in otherwise appropriate circumstances, decline to exercise jurisdiction altogether by either dismissing the suit or remanding it to state court.” Quackenbush v. Allstate Ins. Co., 517 U.S. 706, 720, 116 S.Ct. 1712, 135 L.Ed.2d 1 (1996).
A question is raised as to whether this case is within the scope of the Colorado River stay doctrine. In Colorado River, the Supreme Court held that “in situations involving the contemporaneous exercise of concurrent jurisdiction[ ] ... by state and federal courts” it may be appropriate for the federal court to defer to the state court. 424 U.S. at 817, 96 S.Ct. 1236. However, the Court emphasized that “the circumstances permitting the dismissal of a federal suit due to the presence of a concurrent state proceeding for reasons of wise judicial administration are considerably more limited than the circumstances appropriate for abstention” and should be “exceptional” to justify deferral to the state court. Id. at 818, 96 S.Ct. 1236; see also Rojas-Hernandez v. P.R. Elec. Power Auth., 925 F.2d 492, 495-96 (1st Cir.1991); Villa Marina Yacht *10Sales, Inc. v. Hatteras Yachts (Villa Marina I), 915 F.2d 7, 12 (1st Cir.1990); Bath Mem’l Hosp. v. Me. Health Care Fin. Com’n, 853 F.2d 1007, 1015 (1st Cir.1988). There is a “heavy presumption favoring the exercise of jurisdiction.” Villa Marina I, 915 F.2d at 13. There must be some extraordinary circumstances for a federal court to shrink from “the virtually unflagging obligation of the federal courts to exercise the jurisdiction given them.” Colorado River, 424 U.S. at 817, 96 S.Ct. 1236. The mere pendency of parallel state litigation does not warrant a stay, save for exceptions not pertinent here.
This court has identified six factors, based on the Supreme Court’s decision in Colorado River and its subsequent decision in Moses H. Cone Memorial Hospital v. Mercury Construction Corp., 460 U.S. 1, 103 S.Ct. 927, 74 L.Ed.2d 765 (1983):
(1) whether either court has assumed jurisdiction over a res; (2) the inconvenience of the federal forum; (3) the desirability of avoiding piecemeal litigation; (4) the order in which the forums obtained jurisdiction; (5) whether federal law or state law controls; and (6) whether the state forum will adequately protect the interests of the parties.
Rivera-Puig v. Garcia-Rosario, 983 F.2d 311, 320-21 (1st Cir.1992) (quoting Burns v. Watler, 931 F.2d 140, 146 (1st Cir.1991)). However, this is not an exhaustive list, nor is it a litmus test for Colorado River deference, which must remain a discretionary tool. See Villa Marina I, 915 F.2d at 14.
The first two prongs of the Colorado River /Moses H. Cone test have little bearing on this case. There is no res at issue and the federal forum is equally convenient to the state forum, as both are located in the same city. There is some risk of piecemeal litigation here, which may rise above the “routine inefficiency that is the inevitable result of parallel proceedings.” Villa Marina I, 915 F.2d at 16. The Supreme Court has clarified that the fourth prong (sometimes called the “priority” element) “should not be measured exclusively by which complaint was filed first, but rather in terms of how much progress has been made in the two actions.” Moses H. Cone, 460 U.S. at 21, 103 S.Ct. 927. In this case, both state and federal cases have been through summary judgment and are on appeal, and it may be that the record in the state case is fuller as to the state law issue. See Colorado River, 424 U.S. at 820, 96 S.Ct. 1236 (noting the apparent absence of any federal proceedings other than the motion to dismiss as a factor in favor of dismissal); Villa Marina Yacht Sales, Inc. v. Hatteras Yachts (Villa Marina II), 947 F.2d 529, 535 (1st Cir.1991) (holding that state case was further advanced because of development of record for preliminary injunction hearing).
The concerns implicated by the fifth prong of the test, whether federal or state law controls, are important in this case. Although this case presents exclusively federal law claims, two of the three federal claims are constitutional and therefore should only be adjudicated if we are unable to resolve the case through resolution of the statutory claim. See Ashwander v. Tenn. Valley Auth., 297 U.S. 288, 347, 56 S.Ct. 466, 80 L.Ed. 688 (1936) (Brandéis, J., concurring). If we conclude that Title II encompasses employment practices, we must determine whether the LTD program is protected by the safe harbor provision. That federal statutory question is intertwined with a complex issue of state law, pending before the state courts. Further, the underlying subject matter involves state-provided insurance benefits, a matter in which the state has unusually strong interests.
*11We have noted that “[cjourts generally have agreed that rare circumstances exist only when a case presents ‘complex questions of state law that would best be resolved by a state court.’ ” Villa Marina I, 915 F.2d at 15 (quoting American Bankers Ins. Co. of Fla. v. First State Ins. Co., 891 F.2d 882, 886 (11th Cir.1990)). Colorado River has special appeal where a state court decision “may substantially, perhaps even fully, answer certain questions of state law in a way that will permit easy answers, relatively speaking, to the federal ones.” Kartell v. Blue Shield of Mass., 592 F.2d 1191, 1193-94 (1st Cir.1979) (remanding to district court with order to stay proceedings pending state court outcome or to certify state supreme court).
These comity concerns are the same as those underlying the abstention doctrines that predate Colorado River’s discretionary deferral. In Colorado River, the Supreme Court described these abstention doctrines, stating that abstention is appropriate “where there have been presented difficult questions of state law bearing on policy problems of substantial public import whose importance transcends the result in the case then at bar.” 424 U.S. at 814, 96 S.Ct. 1236 (citing La. Power & Light Co. v. City of Thibodaux, 360 U.S. 25, 79 S.Ct. 1070, 3 L.Ed.2d 1058 (1959), and Burford v. Sun Oil Co., 319 U.S. 315, 63 S.Ct. 1098, 87 L.Ed. 1424 (1943)); see also R.R. Com’n of Tex. v. Pullman Co., 312 U.S. 496, 500, 61 S.Ct. 643, 85 L.Ed. 971 (1941) (discussing “a doctrine of abstention appropriate to our federal system whereby the federal courts, ‘exercising a wise discretion’, restrain their authority because of ‘scrupulous regard for the rightful independence of the state governments’ ”) (quoting Di Giovanni v. Camden Fire Ins. Ass’n, 296 U.S. 64, 73, 56 S.Ct. 1, 80 L.Ed. 47 (1935) and Cavanaugh v. Looney, 248 U.S. 453, 457, 39 S.Ct. 142, 63 L.Ed. 354 (1919)). Although this case does not mandate abstention under any of these established abstention doctrines, the problem it presents is similar to the problems presented by the Pullman or Thibodaux cases, which presented federal courts with the prospect of being required to resolve complicated state law problems. For instance, two of the major purposes of Pullman abstentions are to “avoid[ ] the waste of a tentative decision” and to “avoid[ ] ... needless friction between the federal and state proceedings.” Ford Motor Co. v. Meredith Motor Co., Inc., 257 F.3d 67, 73 (1st Cir.2001) (internal quotation marks omitted); see also Bath Mem’l Hosp., 853 F.2d at 1016 {“Pullman-type abstention ... may be appropriate ... because ... plaintiffs are making identical claims in two state court suits, and the state courts may resolve the claims in ways that would moot, or significantly affect, the claims plaintiffs make here....”).
Much of the rationale supporting abstention in those cases applies to counsel deference here. The state law question is not clear, nor is it clear how the state ultimately would balance the important policy interests of treatment of the disabled with the financial viability of insurance policies. If we were to decide the ADA claim here, we could be forced to make a ruling on whether the policy violates Massachusetts antidiscrimination law, the question before the Massachusetts courts. If we were to decide the federal issues in the manner that the GIC suggests, a state court ruling that the policy violates Massachusetts law would render our opinion merely advisory — an outcome we seek to avoid in any case.8
*12Finally, the sixth prong of the Colorado River /Moses H. Cone test also supports deferring to the state court. A stay under Colorado River is appropriate only where the parties may obtain complete relief in the state court proceedings:
When a[ ] court decides to dismiss or stay under Colorado River, it presumably concludes that the parallel state-court litigation will be an adequate vehicle for the complete and prompt resolution of the issues between the parties. If there is any substantial doubt as to this, it would be a serious abuse of discretion to grant the stay or dismissal at all.
Moses H. Cone, 460 U.S. at 28, 103 S.Ct. 927. Nonetheless, “perfect identity of issues is not a prerequisite.” Villa Marina II, 947 F.2d at 533.
It is very significant to us that it is the plaintiff, the party that initially invoked the jurisdiction of the federal courts, who is now requesting that we stay our hand. Moreover, because the plaintiff is the same in both this case and the parallel state case, there is no danger that the plaintiff will be prejudiced by ineffective prosecution of the state law claim. Nor will the defendant be prejudiced by our staying the action: whatever uncertainty exists as to outcome in this case also exists as to the state court litigation.
The parties have proposed certification as an alternative to a Colorado River stay, and the dissent prefers that course. *13However, the state law question is currently before the state intermediary appellate court, on appeal from the state Superior Court case. If we were to certify, we would be interfering with that normal state appellate process. If the SJC wishes to provide the parties with a more prompt resolution of this question, it can accelerate the appeal by taking direct appellate review of the state law case. Mass. R.App. P. 11(f). In addition, the record before us has been developed to address the federal issues, not the state law question. Therefore, our certification might not provide the SJC with an adequate record on which to decide the question, a requirement under the SJC’s certification rule. The state court case, in which the state law question has been directly litigated, contains a far more appropriate record on which to decide the question. Finally, it is not clear that the SJC would accept certification. The Supreme Judicial Court of Massachusetts Rule 1:03 permits certification “if there are involved questions of law of this state which may be determinative of the cause then pending in the certifying court.” If the SJC holds that the distinction in insurance benefits is not in violation of state law, that will not be determinative of the federal claims. If the SJC holds that the distinction is in violation of state law, that may moot the federal claims. Whether this situation meets the certification requirement is itself an issue of Massachusetts law which we should not decide. On more than one occasion, state high courts have returned certified questions unanswered, because the factual record was undeveloped on the state law question or because there was a risk that its opinion would be merely advisory. See, e.g., Cuesnongle v. Ramos, 835 F.2d 1486, 1491 (1st Cir.1987) (discussing Puerto Rican Supreme Court’s decision not to answer certified question regarding state constitutional law, where state law followed federal law); Lumbermens Mut. Cas. Co. v. Belleville Ind., 407 Mass. 675, 555 N.E.2d 568, 576 (Mass.1990) (returning certified question unanswered because factual record was insufficiently developed); see also Canal Elec. Co. v. Westinghouse Elec. Corp., 406 Mass. 369, 548 N.E.2d 182, 184 (Mass.1990) (noting that “if, in the future, the ‘questions certified to us ... are not accompanied by sufficient nonhypothetical, evidentiary facts to allow us to adequately determine’ the answers, we may decline to answer such questions”). Under these circumstances, certification is not the wisest course available to us.
We hold, therefore, that a stay pending the outcome of the state proceedings is the wisest course of action at this time. We emphasize that we are not surrendering federal jurisdiction and we retain jurisdiction to permit us to resolve the federal questions if a decision is ultimately necessary.
Motion for stay granted.
. Currie has also stated that if her benefits are cut off, she will inevitably become homeless and enter an institution and implies that at that time, she will then begin receiving LTD benefits again. It is not clear from the policy whether, once she becomes ineligible, she would later be able to receive benefits even if she did enter an institution. The GIC has not addressed this issue.
. Currie did not attempt to challenge the LTD policy under Title I of the ADA because of the procedural requirements imposed by Title I. Currie, 147 F.Supp.2d at 33 n. 6.
. For instance, employers that receive federal assistance may be covered by both Title VI (applying to programs and activities that receive federal funds) and Title VII (applying to employment practices) of the 1964 Civil Rights Act. See Guardians Ass'n v. Civil Seiv. Com’n, 463 U.S. 582, 606-07, 103 S.Ct. 3221, 77 L.Ed.2d 866 (1983) (plurality) (district court relief premised on violations of both Title VI and Title VII affirmed in part and reversed in part because relief awarded under Title VI exceeded permitted scope). Similarly, a disabled individual working for a federally funded entity may be covered by both the ADA and the Rehabilitation Act of 1974. See Phelps v. Optima Health, Inc., 251 F.3d 21, 23 & n. 2 (1st Cir.2001).
. There are two long-standing civil rights laws, Section 504 of the Rehabilitation Act of 1973, 29 U.S.C. § 794(a) (1994 & Supp. IV 1998) and Title IX of the Education Amendments of 1972, 20 U.S.C. 1681(a) (1994), under which the phrase "program or activity” has been held to cover employment practices. See Consol. Rail Corp. v. Darrone, 465 U.S. 624, 632-634, 104 S.Ct. 1248, 79 L.Ed.2d 568 (1984) (Rehabilitation Act); North Haven Bd. of Educ. v. Bell, 456 U.S. 512, 520-35, 102 S.Ct. 1912, 72 L.Ed.2d 299 (1982) (Title IX). In addition, Title VI of the 1964 Civil Rights Act, 42 U.S.C. § 2000d, which also uses the "program or activity” language, contains a specific subsection, id. § 2000d-3, limiting its application to employment discrimination to certain instances.
. The Supreme Court has held that state discrimination on the basis of mental retardation will survive an equal protection challenge unless the challenged practice is not rationally related to some legitimate governmental purpose. See City of Cleburne v. Cleburne Living Ctr., 473 U.S. 432, 446, 105 S.Ct. 3249, 87 L.Ed.2d 313 (1985). Other precedent indicates that this test applies to state discrimination against disabled individuals generally. See Bd. of Trs. of the Univ. of Ala. v. Garrett, 531 U.S. 356, 367, 121 S.Ct. 955, 148 L.Ed.2d 866 (2001) ("States are not required by the Fourteenth Amendment to make special accommodations for the disabled, so long as their actions toward such individuals are rational.”); Currie, 147 F.Supp.2d at 33 (citing City of Cleburne for the proposition that "it is well established that, for purposes of this analysis, the disabled do not constitute a suspect classification”).
. Currie argues that only the cost justification was presented to the district court.
. The question of whether to defer to the parallel state proceedings was not before the district court, and therefore our holding is not an indication that the district court abused its discretion in any way by failing to defer. Cf. Moses H. Cone Mem’l Hosp. v. Mercury Constr. Corp., 460 U.S. 1, 19, 103 S.Ct. 927, 74 L.Ed.2d 765 (1983) (question of whether to defer is within the discretion of the district court). Nor do we view this issue as having been waived by Currie because she did not move for a stay before the district court' — a federal court's discretionary authority to defer to a state court due to comity reasons may be invoked regardless of whether the parties request it.
. Nothing in this opinion undercuts any res judicata effect of the Superior Court judg*12ment, an argument which the dissent creates sua sponte and on which it relies. By the same token, the res judicata effect of a lower state court judgment does not compel the active exercise of federal jurisdiction, rather than a stay when federal doctrines of restraint counsel otherwise. This is true whether the doctrines of restraint counsel certification of questions "to the State’s highest court” to avoid reaching federal questions, see Arizonans for Official English v. Arizona, 520 U.S. 43, 78, 117 S.Ct. 1055, 137 L.Ed.2d 170 (1997), or whether they counsel abstention, see generally Heck v. Humphrey, 512 U.S. 477, 114 S.Ct. 2364, 129 L.Ed.2d 383 (1994) ("[I]f a state criminal defendant brings a federal civil-rights lawsuit during the pendency of his ... appeal ... abstention may be an appropriate response...."); Ford Motor Co. v. Meredith Motor Co., 257 F.3d 67 (1st Cir.2001) (Pullman abstention appropriate where state administrative board ruling was on appeal to state superior court); Amerson v. State of Iowa, 94 F.3d 510, 512 (8th Cir.1996) (Bur-ford abstention on claim for interference with parental rights appropriate where state court appeals were pending); Turnbow v. Pac. Mut. Life Ins., 934 F.2d 1100, 1103 (9th Cir.1991) ("The time for Pacific Mutual to oppose Turn-bow's abstention argument was before the Nevada Supreme Court reached its decision.”).
Here the doctrine of sound judicial administration which underlies Colorado River deferral has even more force because the state proceeding is already on appeal on a fully developed record. See Hearne v. Bd. of Educ., 185 F.3d 770, 778 (7th Cir.1999) (holding that the "principles of sound judicial administration which animated the decision in Colorado River ... require[d] a stay of the federal proceedings” pending outcome of appeal in parallel state court proceedings); Rogers v. Desiderio, 58 F.3d 299, 302 (7th Cir.1995) ("It is sensible to stay proceedings until an earlier-filed state case has reached a conclusion” on appeal); Akins v. Rodriguez, 15 F.3d 883, 887, vacated per stipulation, 26 F.3d 105 (9th Cir.1994) (Colorado River abstention appropriate where state appellate court decision on appeal to state supreme court). The party who invoked jurisdiction here has sought the stay and the defendants have not raised the argument made by the dissent, even in their post-argument filings after the Superior Court judgment, and so it is forfeited. See Soares v. Brockton Credit Union, 107 F.3d 969, 972 n. 1 (1st Cir.1997) (noting that defendant never raised res judicata issue and therefore court will deem argument to be waived); see also Walsh v. Int'l Longshoremen’s Ass’n, 630 F.2d 864 (1st Cir.1980) (court may raise res judica-ta issue sua sponte where parties argued res judicata before district court but not on appeal). Even had it not been forfeited, the interests served by res judicata are better served by the stay.