As the Supreme Court is poised to rule on same-sex marriage, evangelical Christian leaders, once unified on the topic, are expressing opposing viewpoints, even though polls show a majority of the movement's rank-and-file oppose it.

The Pew Research Center reported this week that 70 percent of white evangelicals and 57 percent of black Protestants oppose legalizing same-sex marriage, while "majorities of white mainline Protestants (62 percent) and Catholics (56 percent) support same-sex marriage."

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According to the Washington Post report, the moves by Campolo and Neff, and earlier pro-same sex marriage announcements from the Rev. Jim Wallis of Sojourners and ethics professor David Gushee, may be signs of a shift ahead.

"Evangelicals are like dominoes," the paper quoted Dartmouth University historian Randall Balmer as saying. "We’re seeing one more indication that evangelicals are moving on this issue rather dramatically, as is the rest of the culture."