The epoch of the cultural wedge issue is ending, says Democratic political analyst Ruy Teixeira, in his new report, "The Coming End of the Culture Wars" (PDF). And equal marriage will soon lose its political potency. It's baked in the demographic cake.

That's because of generational change, as culturally progressive Millennial voters surge into the electorate. It's also, more immediately, because of the decline in the number of white working-class voters. And the fastest growing religious group is not evangelicals but seculars, who tend to be very culturally progressive.