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UNITED STATES - AUGUST 14:  Republican presidential candidate Rick Santorum, left, greets Sen. Chuck Grassley, R-Iowa, at the Lincoln Day Dinner hosted by the Black Hawk County Republican Party in Waterloo, Iowa.  Santorum, Texas Gov. Rick Perry, and Rep. Michele Bachmann, R-Minn., addressed the gathering.  (Photo By Tom Williams/Roll Call)

UNITED STATES - AUGUST 14: Republican presidential candidate Rick Santorum, left, greets Sen. Chuck Grassley, R-Iowa, at the Lincoln Day Dinner hosted by the Black Hawk County Republican Party in Waterloo, Iowa. Santorum, Texas Gov. Rick Perry, and Rep. Michele Bachmann, R-Minn., addressed the gathering. (Photo By Tom Williams/Roll Call)

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