Look at these statistics from an article in USA Today:
“By more than 2-1 (67%-32%), those surveyed last month said they would vote for a well-qualified gay candidate for president if he or she were nominated by their party. In comparison, 94% would vote for a black person, 93% for a woman, 89% for a Hispanic person, 76% for a Mormon and 49% for an atheist.”
Wow. Even the Mormons and the gays have the atheists beat.