Newt Gingrich

Associated Press
FILE - In this Oct. 31, 2011 file photo, then-Republican presidential candidate Herman Cain holds up a muffin that has his catch-phrase 9-9-9 tax plan printed on it  before speaking at the National Press Club in Washington. 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/Pablo Martinez Monsivais)

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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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