In 1960, just 5 percent of Republicans...

In 1960, just 5 percent of Republicans and 4 percent of Democrats said they would be unhappy if a son or daughter married someone from the other party. In a YouGov survey from 2008 . . . 27 percent of Republicans and 20 percent of Democrats said they’d be “somewhat” or “very upset” by that prospect. By 2010, that share had jumped to half of Republicans and a third of Democrats. .