About a third of American adults believe the JFK assassination was pulled off by a conspiracy, a new survey suggests. About the same number say he was the victim of a lone gunman.

Rasmussen Reports surveyed more than 1,000 Americans on some of the most common conspiracy theories. It found that 32 percent believe more than one shooter was involved in John F. Kennedy's assassination, which was slightly less than the 37 percent who said he was a victim of a larger conspiracy when a similar survey was conducted in November around the 50th anniversary of the event.

Other conspiracy ratings:

Almost one in four believe the government new about the Sept. 11, 2001 terrorist attacks before hand and did nothing to stop them.

About the same number say Obama is not an American citizen. (That goes to two out of five for Republicans surveyed.)

One in five believe a UFO with aliens crashed near Roswell, New Mexico, in 1947.

About one in seven (14 percent) say the U.S. faked the moon landing in 1969.

Almost the same number (13 percent) say the British Royal Family had Princess Di killed.

Disbelief was high, however, that Paul McCartney was killed and replaced by someone else in the Beatles. Only 3 percent believe the Walrus is Paul. (Oblique reference explained inside the blog.)

At the risk of sounding ancient, the theory that Paul McCartney had died and was replaced by a lookalike prompted a search for clues in the lyrics of Beatles' songs.

The song "Glass Onion" has a line: "Well here's another clue for you all. The walrus was Paul." That's a reference back to a previous song "I am the Walrus" and "Glass Onion" has references to other songs, too.

According to the conspiracy theory, the walrus was the Eskimo symbol for death, or the Viking symbol for death, or the English symbol for death (it varied.) so John Lennon was telling people McCartney was dead. 

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