The Democrat-led movement to lower the legal voting age to 16 — or in some cases even younger — is gaining momentum as teenagers and other activists seek to score local victories while winning the support of some voices in the media. The so-called "Vote 16" campaign recently notched a victory in Vermont, where the Democrat-controlled state legislature last month overrode Republican Gov. Phil Scott's veto of a measure allowing 16-year-olds to vote in municipal elections and hold the highest elected offices. Specifically, 16- and 17-year-olds can now vote in the southern Vermont town of Brattleboro. Young voters will be...