Left to right: Former Sen. Rick Santorum; Rep. Michele Bachmann; former House Speaker Newt Gingrich; former Massachusetts Gov. Mitt Romney; Rep. Ron Paul; former Minnesota Gov. Tim Pawlenty; entrepreneur Herman Cain. Emmanuel Dunand /AFP/Getty Images hide caption

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Emmanuel Dunand /AFP/Getty Images

NPR's Ari Shapiro on 'Morning Edition'

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Tim Pawlenty in Iowa at the Fayette County Republican Party Spring Fundraiser, April 2, 2011. Martin Kaste/NPR hide caption

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