There was a time when evangelical Christians were peace-making unifiers in American politics: an era that produced the closest thing to a Protestant saint the nation has ever seen. Billy Graham’s mass appeal stemmed in part from his aversion to partisan politics. The Southern Baptist minister is estimated to have preached to over 215 million people, and enjoyed personal audiences with 12 consecutive US presidents, from Harry Truman to Barack Obama, advising them on religious matters regardless of which party they represented.