While the questions apparently haven't struck a blow against Cain in Iowa, their persistence is giving some GOP caucus-goers pause at a critical time.
A recent poll of likely Iowa caucus-goers sponsored by The Des Moines Register showed Cain narrowly leading in Iowa.
But Cain has a smaller campaign staff in the early states than many of his rivals.
The questions aren't discouraging Iowa state Rep. Henry Rayhons from siding with Cain — yet.
"He's got to come clean, or people are going to keep harassing him about it," said Rayhons. "The longer it hangs out there, the less likely I am to support him."
Associated Press writers Jim Davenport in South Carolina, Phil Elliott in Iowa, Laurie Kellman in Washington and Holly Ramer in New Hampshire contributed to this report.
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