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Republican presidential candidates (L-R) Rick Santorum, Rick Perry, Mitt Romney, Newt Gingrich, Ron Paul, Michele Bachmann and Jon Huntsman Photo at last presidential debate of 2011 in Sioux City, Iowa (Credit:Jeff Haynes)

Republican presidential candidates (L-R) Rick Santorum, Rick Perry, Mitt Romney, Newt Gingrich, Ron Paul, Michele Bachmann and Jon Huntsman Photo at last presidential debate of 2011 in Sioux City, Iowa (Credit:Jeff Haynes)