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DENVER, CO - FEBRUARY 7: Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves to supporters during a rally with supporters in the Tivoli Student Union on the Auraria Campus on February 7, 2012 in Denver, Colorado. According to early results, Santorum defeated former Massachusetts Gov. Mitt Romney, former Speaker of the House Newt Gingrich and U.S. Rep. Ron Paul (R-TX) in Missouri, Minnesota and is in a tight race with Romney in Colorado. (Photo by Marc Piscotty/Getty Images)
DENVER, CO - FEBRUARY 7: Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves to supporters during a rally with supporters in the Tivoli Student Union on the Auraria Campus on February 7, 2012 in Denver, Colorado. According to early results, Santorum defeated former Massachusetts Gov. Mitt Romney, former Speaker of the House Newt Gingrich and U.S. Rep. Ron Paul (R-TX) in Missouri, Minnesota and is in a tight race with Romney in Colorado. (Photo by Marc Piscotty/Getty Images)

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