Gallup Poll: Bubba Logic Leads US Opinions: "Despite no evidence thus far to support a direct link between Saddam Hussein and the 9/11 attacks, public opinion polls have shown the public widely believing that Saddam Hussein was somehow connected with these attacks.[ ...] a Washington Post poll showed that almost 7 in 10 Americans thought it likely that Saddam was involved in the attacks.

[...] the weekend CNN/USA Today/Gallup poll shows that close to half of Americans nevertheless continue believe that Saddam was personally involved in the 9/11 attacks. This is down only 8 points since the last asking, just before the Iraq war started in March"

What's missing in this poll is some good correlation data such as "Do you believe that the US government has made contact with extraterrestrials?"