Whether Congress could require every State to permit citizens age 18 and older to vote in federal elections.
Holding
Yes. The 18-year-old voting provision was constitutional and enforceable in elections for federal offices.
Reasoning
Justice Black concluded that Article I, § 4 gives Congress ultimate supervisory authority over the “Times, Places and Manner” of congressional elections. Read with the Necessary and Proper Clause and the Court’s prior election cases, that power was broad enough to let Congress alter voter qualifications for federal elections, including the minimum voting age.
Black reasoned that Congress’s authority over federal elections had historically extended beyond mere mechanics. Congress could regulate districting, registration, voting procedures, fraud prevention, vote counting, and other measures needed to ensure representative national elections. Allowing 18-year-olds to vote was, in his view, a less consequential exercise of that authority than Congress’s undisputed authority to regulate congressional districts.
The Court also sustained the voting-age provision as applied to presidential and vice-presidential elections. Black viewed Congress’s authority to secure responsive national elections as extending to the selection of presidential electors as well as members of Congress.
No single rationale commanded a majority. Justice Black relied on Congress’s election-regulation power; Justices Douglas, Brennan, White, and Marshall agreed with the federal-election result but would have upheld the provision under Congress’s Fourteenth Amendment enforcement power.