Some people will believe anything:
One-in-four adults (24%) are convinced that the U.S. government knew in advance about the September 11, 2001 terrorist attacks and did nothing to stop them, and 19% more are not sure. Only 57% say that conspiracy theory is false.Elvis and the Illuminati were unavailable for comment...
Just as many (23%) say the theory that Obama is not an American citizen is true, with another 17% who aren't sure. Sixty percent (60%) reject that theory as false.
Interestingly, however, more Americans (82%) are willing to declare as false the theory that Paul McCartney was killed in a car crash in 1966 and replaced by the Beatles than are willing to reject any of the other conspiracy theories we asked about.