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Technician Richie Beanan irons the U.S. flag on stage in anticipation to a rally with supporters on Iowa caucus night for Republican presidential candidate, former Massachusetts Gov. Mitt Romney at the Hotel Fort Des Moines Jan. 3, 2012 in Des Moines, Iowa. Candidates made a final push to try and sway voters as Iowans took part in the first caucus of the 2012 presidential election.
Jeff Haynes / Reuters
A Gingrich caucus worker looks on as Iowa caucus goers arrive and sign in for the caucus at the UNI Dome on the campus of the University of Northern Iowa, Jan. 3, 2012.
Jonathan Gibby / Getty Images
A young boy prepares to leave school before the arrival of voters at the Waukee Precinct 4 GOP Caucus held at Walnut Hills Elementary School Jan. 3, 2012 in Urbandale, Iowa. After months of campaigning by candidates, Iowan voters throughout the state prepare to participate in the first caucus of the 2012 presidential election.
Dave Weaver / AP
Chris Kreger and John Carr talk outside a caucus Tuesday Jan 3, 2012 at precinct 42 near Smithland, Iowa.
The latest polls show former Massachusetts Gov. Mitt Romney, Texas Rep. Ron Paul and former Pennsylvania Sen. Rick Santorum are leading the race in Iowa. But as the caucus race draws to a close, the rhetoric is escalating. NBC's Andrea Mitchell reports.