Eagerly anticipating the defeat in Iraq to which they are so much attached, some on the left have also been preparing for another contingency: the assault that they think they see coming, a drive to pin the whole wretched failure on them. Apparently, this will be "stab in the back" redux, a new iteration of the theme deployed so successfully in interwar Germany by a resourceful, ambitious Austrian corporal, who managed to propel his rise to power with the claim that World War I would have been won by his country, if not for sinister forces at home. Then, it...