NYT: Tumultuous social changes that began in the 1960s supplied decades of political ammunition for Republicans. Beginning with Richard M. Nixon, they rallied Americans disturbed by noisy protests over civil rights, the sexual revolution and the Vietnam War.

“Acid, amnesty and abortion” was the epithet hurled at the 1972 Democratic presidential candidate, George McGovern. Republicans seized on concerns about welfare, school busing and crime — memorably with a black convict named Willie Horton in 1988 — to cement their grip on white voters. As recently as 2004, Republicans used a proposed constitutional amendment banning same-sex marriage to rally tradition-minded “values voters” behind President George W. Bush’s re-election.

Now the values wedge cuts for Democrats.