Newt Gingrich

Associated Press
FILE - In this Feb. 7, 2012 file photo, Republican presidential candidate, former House Speaker Newt Gingrich, accompanied by his wife Callista, speaks in Cincinnati, Ohio. Presidential campaigns and outside political groups began filing detailed financial reports Monday, offering a behind-the-scenes glimpse into the identities of wealthy supporters who will help elect the next president and details on how tens of millions of campaign dollars have been spent.  (AP Photo/Evan Vucci, File)

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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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