An image from a superPAC ad attacking Newt Gingrich, whose campaign called on TV stations to pull the ad off the air. Restore Our Future hide caption

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Rick Santorum and Mitt Romney took the stage in a January presidential debate in Florida. They'll meet again Wednesday night in Arizona, which holds its primary on Feb. 28, the same day as the crucial Michigan contest. Paul Sancya/AP hide caption

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Then a congressman from Georgia, Newt Gingrich laughs at a joke told by President Reagan in Atlanta in 1984. Joe Holloway Jr./AP hide caption

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Republican presidential hopeful Newt Gingrich made campaign stops on Florida's Space Coast on Wednesday, saying space is part of America's destiny and outlining what he called a bold plan to send Americans to the moon and beyond. Here, the former House speaker delivers remarks outside a restaurant in Coral Springs, Fla. Paul J. Richards/AFP/Getty Images hide caption

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