For all their visibility along the campaign trail, A-list celebrities hold little sway over the way Americans vote, an omnibus poll for CBS News and Vanity Fair magazine suggested Monday.

Eighty-nine percent of respondents said celebrity endorsements of a particular candidate made no difference to them when it came to putting an X beside a name in the voting booth.

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Three percent even said a celebrity endorsement would make them less likely to favor a candidate. Just two percent said they were more likely to favor a hopeful on the basis of a celebrity’s thumbs-up.

Boldface names have featured prominently in the run-up to the November 6 elections, with the likes of George Clooney supporting Barack Obama and Clint Eastwood siding with Republican rival Mitt Romney.

In a statement, CBS News said pollsters contacted a random sample of 1,218 adults across the United States by telephone from August 22-26, with an overall margin of error of plus or minus three percentage points.

On other topics, 70 percent of respondents said they did not believe Scientology was a true religion, and 41 percent said they would alert the authorities if they saw a Mexican family crossing the border illegally.

Nineteen percent said they they’d prefer their children to marry into the Obama family, rather than wed a Kennedy (18 percent) or a member of the British royal family (16 percent).