More Republicans have defected to the withdraw-from-Iraq Democrats. They have read the polls that show falling support among the American people for the war in Iraq, and have concluded that continuing to support the war will cost them their Senate or House seat. Is it possible that some of these Republicans have simply consulted their consciences and decided to abandon positions they have held since the beginning of the war? It is possible. But consider this: If the American people continued to support the war, does one reader of this column believe that one Republican defector would have in fact...