Not only have the country’s two main political parties split further apart on such issues, but political feeling also runs deeper than it did in the past. In 1960, when a survey asked American adults whether it would “disturb” them if their child married a member of the other political party, no more than 5 percent of either party answered “yes.” But in 2010, 33 percent of Democrats and 40 percent of Republicans answered “yes.” In fact, partyism, as some call it, now beats race as the source of divisive prejudice.
