concurring in the result.
I concur in the result reached by the Court but I do so under the mandate of Allen v. State Board of Elections, *542393 U. S. 544 (1969). I have previously expressed my reservations as to the correctness of that holding. See Perkins v. Matthews, 400 U. S. 379, 397 (1971) (Blackmun, J., concurring in judgment).