I am actually pretty sympathetic to this interpretation. From a reader:

I think people are reading too much (or maybe its not enough) into the “Bush knew” poll. Like many polls that ask things other than who will you vote for, the answers are a proxy for registering some other opinion. No way do over 60% of Democrats think Bush either knew about 9/11 or might have known. No way. The poll should be properly read as: How much do you hate President Bush? 35% would like to personally torture and kill him, 26% wish he would die but wouldn’t do the killing themselves, and 39% don’t hate his guts.