Kathy Shaidle points to an interesting essay in City Journal about the messaniac nature of modern American politics.
Religion has long been a powerful force in American politics, of course, for good and ill. The difference with the more traditional varieties of religion was the open acknowledgment that they were religious. The First Amendment promised that they could never become established churches; generations’ worth of jurisprudence closely regulated the way they could interact with government. And when a campaigning politician acknowledged forthrightly that he derived a policy from, say, his understanding of the Bible, his potential constituents understood that, however reasonable the policy might be, what underlay it was faith, not reason. The emerging liberal religions are very different: as emotionally captivating for some, at least for a time, as Christianity or Judaism, but untrammeled by any constitutional amendment; as grounded in faith, but pretending to dwell in the realms of reason and science.