For quite awhile after September 11, we were a people united in the war on terror. By now we have let the adrenal pleasures of political fighting over the presidency dissipate the difficult emotions of staying united against a real enemy. The war in Iraq has contributed, but you can't lay it all off on Iraq. The ambiguity of the Moussaoui jury is a portent. See "United 93." It is very difficult. It should be.