From Rasmussen, America's most accurate polling agency,

"Democrats in America are evenly divided on the question of whether George W. Bush knew about the 9/11 terrorist attacks in advance. Thirty-five percent (35%) of Democrats believe he did know, 39% say he did not know, and 26% are not sure.

Republicans reject that view and, by a 7-to-1 margin, say the President did not know in advance about the attacks. Among those not affiliated with either major party, 18% believe the President knew and 57% take the opposite view.

Overall, 22% of all voters believe the President knew about the attacks in advance. A slightly larger number, 29%, believe the CIA knew about the attacks in advance."

So, if you're talking to Democrats, there's a 50% chance they're conspiracy loons, about an 18% chance the independents are crackers, and Republicans are the least crazy, coming in at about 12.5%.

PS: Incidentally, this is why I think so many people are making a big mistake when they ignore these wacko conspiracy theories about 9/11, the North American Union Conspiracy, Jews ruling the world, etc. It's because if people who know better don't speak up, they allow the crazies to dominate the conversation by default and the public may not know the difference.