Republican presidential candidate Herman Cain kept to his campaign schedule Wednesday, despite the latest accusation that he had a long-time affair.
Some political experts say Cain's trouble could shake up the GOP race one more time.
But a new poll shows President Barack Obama has some trouble of his own with voters.
Tuesday, Cain said he was "reassessing" whether to continue his campaign for the White House. But the next day, he sounded defiant at an Ohio campaign stop.
"Character assassination -- some predicted nobody would be here. I don't see any empty seats," he said.
Meanwhile, Atlanta resident Ginger White gave details on ABC's "Good Morning America" about what she claimed was a 13-year "on and off" sexual relationship with Cain.
"I can't make this stuff up," she said. "And frankly speaking, I wouldn't want to make this up."
White said Cain gave her money and gifts several times, but that the relationship "wasn't sex for cash."
"It was a very casual affair. Am I proud to admit that? No, I am not," she explained. "It was a very casual affair... Herman flew me ... I went on several trips with him. One particular trip was the Mike Tyson-Holyfield fight in Las Vegas."
White produced evidence of 61 text messages with Cain, including several as recent as this month.
Cain wrote to his supporters that, "A troubled Atlanta businesswoman used national media outlets to promote a fabricated, unsubstantiated story about a 13-year affair with me." He called the story "completely false."
Cain's fellow GOP candidates are staying cautious, including Newt Gingrich, who has admitted to infidelity in the past.
"I think it's his decision to make. He has to do what he thinks is best," Gingrich said of whether Cain should quit his campaign.
"Let's wait and see what Herman decides to do," candidate Rick Santorum added. "It's obviously a very troubling allegation, very troubling situation surrounding his campaign."
While Republicans look for clarity in their race, President Obama's seems to be struggling to connect with American voters.
The latest Gallup survey gave Obama the lowest ratings in modern history for an incumbent president at this stage in his term.
The previous worst numbers were for Jimmy Carter, who lost re-election to Ronald Reagan in 1980.