Jacksonville, Florida (CNN) - A super PAC supporting Newt Gingrich is hitting the Florida airwaves Friday with a television ad that essentially accuses Mitt Romney of committing Medicare fraud.
And now one of Gingrich's leading backers in Florida, former Attorney General Bill McCollum, is also raising questions about a Massachusetts medical testing company called Damon Corp. that pleaded guilty in 1996 to fraudulently billing Medicare and paid a $119 million fine.
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Romney sat on the board of directors of Damon Corp. after his private equity firm Bain Capital took control of the company in 1989. The fraudulent billing occurred while Romney was on the board, and he personally profited when Bain sold off the firm in 1993.
Romney was never implicated in any wrongdoing, but McCollum, a co-chair of Gingrich's Florida campaign, told CNN that the episode raises questions that are "fair game" in a political campaign.
"I think it raises a serious question about his corporate judgment," McCollum said. "It raises serious questions about his fiduciary responsibility as a board member not to ask the questions that you would ask. Maybe he didn't spend the time because of the nature of the investment banking business he was in. He may have just been on the board because they wanted him on the board."
McCollum said he does not believe that Romney was personally guilty of fraud while sitting on the Damon board.
"But did he perform the function he should have performed?" McCollum continued. "Or was he negligent in that function? Did he really ask the tough questions and get himself immersed in the business he was a board member on, and do the job of unearthing this before the federal government did? Clearly they said he didn't. That's the issue there, not his behavior."
McCollum knows something about Medicare fraud as a campaign issue.
He sought the Republican gubernatorial nomination in 2010 against former health care executive Rick Scott, who once ran a company that paid the largest Medicare fraud fine in American history.
Scott narrowly defeated McCollum in the primary after running an avalanche of television ads and went on to with the governorship.
The labor union AFSCME is also running an ad in Florida accusing Romney of "corporate greed" for profiting off the Damon deal.