A good example
From Kevin Drum, one of the smarter leftists on the blogosphere. Not nuts enough to believe Bush knew about 9/11, but firmly of the belief that al Qaeda will stop being a threat when we leave Iraq (what happens then in Afghanistan? "Next question, please") and he's not even sure al Qaeda in Iraq really IS al Qaeda.
The huge amount of information that has to be shoved firmly aside in order to maintain this delusion includes countless proclamations and writings of the enemy, never mind the facts on the ground on their networks and support lines.