White House hopeful Mitt Romney eyes Iowa breakthrough

Republican candidates will contest polls this week to pick challenger to president Obama in 2012
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Former Massachusetts governor Mitt Romney speaks during a campaign stop on January 1, 2012 in Council Bluffs, Iowa (Getty Images)
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With two days before the Iowa caucuses, Mitt Romney is continuing his bus tour through Iowa (Getty Images)
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Republican presidential hopeful and former Massachusetts governor Mitt Romney (L) embraces his wife Ann Romney (Getty Images)
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Volunteer Ken Brolin calls Iowans from Newt Gingrich's Iowa headquarters on Jan 1, 2012 (Getty Images)
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Volunteers work at Newt Gingrich's Iowa headquarters (Getty Images)
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The GOP presidential contenders are crisscrossing Iowa in the final stretch of campaigning in the state before the Jan 3 caucus (Getty Images)
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Republican presidential candidate former US Senator Rick Santorum speaks during a campaign rally (Getty Images)
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Republican presidential candidate Newt Gingrich (Getty Images)
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Zohaib Shaikh, 6, waits to meet Republican presidential candidate Newt Gingrich (Getty Images)
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Callista Gingrich, wife of Republican presidential candidate Newt Gingrich. The caucus will be the first test the candidates must face before becoming the Republican presidential nominee (Getty Images)