Newt Gingrich

Associated Press
Former House Speaker Newt Gingrich and his wife Callista walk onto the stage to speak to delegates during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Charlie Neibergall)

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Republican presidential candidate Newt Gingrich took to the podium in a Las Vegas honky-tonk bar to slam Mitt Romney ahead of the Feb. 4 primary in Nevada.

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