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UNITED STATES - AUGUST 14:  Republican presidential candidate Rick Santorum greets attendees of 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 greets attendees of 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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