Rhode Island v. Palmer — Opinion of the Court
“ And equally worthless is the analogy that the government assays between the power of the national government and the power of the states to criminally punish violations of their respective sovereignties, as, for instance, in counterfeiting cases. In such cases the exercises of sovereignty are not in antagonism. Each is inherently possessed and independently exercised, and can be enforced no matter what the other sovereignty may do or abstain from doing. On the other hand, under the government's construction of section 2, the legislation of Congress is supreme and exclusive. ”
