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Mitt Romney's campaign is running an ad that tries to link Newt Gingrich to the housing foreclosure crisis through his work for Freddie Mac ...

Republican presidential candidate Newt Gingrich on Friday called on a well-heeled outside group supporting his candidacy to correct the inaccuracies in a half-hour film highly critical of GOP front-runner Mitt Romney's career as a venture capitalist or "pull it off the air and off the internet entirely."

As Iowa Republicans take in the final appeals before tonight’s caucus voting, one major lesson the candidates will take away: Going negative works. An estimated $5.8 million was spent on television advertising in Iowa through Dec. 30, with $3.7 million financing negative ads, according to most recent data available from New York-based Kantar Media’s CMAG, a company that tracks advertising.

Alarmed by Newt Gingrich’s decline in the polls in the face of a fusillade of negative advertisements, some senior aides and grass-roots supporters have suggested that he reverse course and fight fire with fire, fearing for the future of his candidacy if he does not.