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Nothing can be more evident, than that an exclusive power of regulating elections for the National Government, in the hands of the State Legislatures, would leave the existence of the Union entirely at their mercy . . . . It is to little purpose to say that a neglect or omission of this kind [not letting the feds have elections], would be unlikely to take place. The constitutional possibility of the thing, without an equivalent for the risk, is an unanswerable objection.