Sometimes we forget that before Howard Dean’s infamous “YEARRRGH!” moment, there were a bunch of signs that he was hitting the skids beforehand. First there were a couple of brusque debate moments – I remember Peggy Noonan comparing him to a teapot that looked ready to boil over. But the other big warning sign came when a guy at an Iowa town hall meeting asked for less negative campaigning and a Biblical teaching of “love thy neighbor”, and Dean gruffly snapped to a “George Bush is not my neighbor.” When the questioner interrupted Dean, he shouted, “You sit down! You...