1064
Souter, J., dissenting
ation of race short of dilution, without being told how to do it. The tendency of these conflicting incentives is toward a stalemate, and neither the moral force of the Constitution nor the mercenary threat of liability can operate effectively in this obscurity.
As a consequence, where once comprehensible districting obligations confronted the legislators and governors of the States, there is now a vacuum of responsibility in any State with the mixed population from which Shaw suits come. We can no longer say with the old assurance that such States have a duty to comply with federal requirements in districting, since a State, like an individual, can hardly be blamed for failing to fulfill an obligation that has never been explained. It is true, of course, that a State may suffer consequences if the ultimate arbiter decides on a result different from the one the State has put in place, but that bad luck does not change the fact that a State cannot be said to be obliged to apply a standard that has not been revealed. Because the responsibility for the result can only be said to rest with the final arbiter, the practical responsibility over districting has simply shifted from the political branches of the States with mixed populations to the courts, and to this Court in particular. "The Court has apparently set itself upon a course of . . . reviewing challenged districts one by one and issuing opinions that depend so idiosyncratically on the unique facts of each case that they provide no real guidance to either lower courts or legislatures." Karlan, Post-Shaw Era 288. The tragedy in this shift of political responsibility lies not only in the fact of its occurrence in this instance, but in the absence of coherent or persuasive justifications for causing it to occur.
III
Although today's cases do not address the uncertainties that stem from Shaw's underlying incoherence, they do aim to mitigate its inscrutability with some specific rules.
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