They think they are the only Christians in America. After all "How could a Democrat be a Christian?" By asking such questions they expose just what they are, self-righteous politically driven people who really don't care about the gospel at all. Like the Scribes and Pharasees of Jesus' time they are not really Christians but politicians who use their false gospel for political ends. Like the Scribes and Pharasees they will not fare well at the Judgement.