Ross Douthat: But is religious diversity a good thing?
                                
                                
                                    (Newser) -
                                    In the 20th century, most US presidents and presidential candidates were Baptists, Episcopalians, Presbyterians—in other words, Protestants. But in the 2012 presidential race? With a Mormon, a traditionalist Catholic, and a nondenominational Christian with ties to liberation theology, "we finally have a presidential field whose diversity mirrors the...