Newt Gingrich

Associated Press
FILE - In this March 21, 2012 file photo, Republican presidential candidate, former House Speaker Newt Gingrich speaks in Lafayette, La. The Republican primary campaign is already fading into memory. Remember Herman Cain's 9-9-9 tax plan? Newt Gingrich's "moon base" proposal? Or Rick Perry's "oops" moment _ when he couldn't recall that third federal agency he wanted to eliminate?  (AP Photo/Julia Rendleman, 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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