"Liberals' assertion that they 'knew all along' that the war in Iraq would go badly are guilty of the hindsight bias. This is not to say that they didn't always think that the war was a bad idea. It is to say that after it was apparent that the war was going badly, they assert that they would have assigned a higher probability to that outcome than they really would have assigned beforehand," - Hal Arkes, a psychologist at Ohio State University, who has studied "hindsight bias" and how to overcome it.