Newt Gingrich

Associated Press
Former House Speaker Newt Gingrich gestures as he speaks at the 40th annual Conservative Political Action Conference in National Harbor, Md., Saturday, March 16, 2013. It may seem early, but the diehard activists who attended the three-day conference are already picking favorites in what could be a crowded Republican presidential primary in 2016. (AP Photo/Carolyn Kaster)

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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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