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The latest development comes just two days before Republican candidates gather in Rochester, Michigan, on Wednesday night for the latest in a series of campaign debates.

At least three other women have accused Cain of sexual harassment from his time as the restaurant industry’s top lobbyist in the mid-1990s. Cain, 65, insists the claims are baseless and that he was wrongfully accused.

A Reuters/Ipsos poll released on Sunday showed the percentage of Republicans who viewed Cain favorably dropped 9 percentage points, to 57 percent from 66 percent a week ago.

The survey was the first evidence that sexual harassment claims against Cain have taken a toll on his presidential aspirations.

A woman who received a cash settlement from the restaurant association in response to her harassment claim rejected Cain’s denials on Friday. She said through her lawyer she was the victim of a “series of inappropriate behaviors and unwanted advances” by Cain in 1999.

One of Cain’s Republican presidential adversaries called on Sunday for more information on the allegations.

“It has got to come out in total,” Republican presidential hopeful Jon Huntsman told NBC’s “Meet the Press” on Sunday. “Legitimate questions have been raised and that information has to come forward.”

Republican presidential candidate Ron Paul said on “Fox News Sunday” that the media went too far in covering the allegations, distracting voters from more important issues.

“The media blew this way out of proportion,” Paul said. “There are a thousand stories out there and I think that dilutes the real debates, because (Cain’s) views on foreign policy for instance are dramatically different than mine.” (Additional reporting by Steve Holland in Washington; Editing by Peter Cooney)

© 2011 Thomson Reuters with files from Agence France-Presse