William J. Brennan,
Oregon v. Mitchell — Concurring…
“ We are not faced with an assertion of congressional power to regulate any and all aspects of state and federal elections, or even to make general rules for the determination of voter qualifications. Nor are we faced with the assertion that Congress is possessed of plenary power to set minimum ages for voting throughout the States. Every State in the Union has conceded by statute that citizens 21 years of age and over are capable of intelligent and responsible exercise of the right to vote. ”
