But Cain was not interested in further discussing the matter in an interview Tuesday morning with Radio Iowa.

“There has been no new information, no new data, no new facts, no new nothing, so there isn’t anything that we can do other than to stay on message,” Cain said.

While Cain acknowledged that the controversy had dogged his campaign, he argued that Iowa voters would stand by him.

“Some people are going to naturally convict me in the court of public opinion and so all I can do is ask them to consider the facts,” Cain said. “The good news is most of the voters here have considered the facts, that those accusations are baseless, and we are moving on.”

Recent polling has not entirely borne out Cain's optimism. Forty-four percent of voters perceive Cain "unfavorably," up from just 17 percent last month, according to a new Washington Post/ABC News Poll. Another poll of Iowa released by Bloomberg Tuesday found Cain had fallen into a four-way tie with Mitt Romney, Ron Paul and Newt Gingrich.