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UNITED STATES - AUGUST 13:  Republican presidential candidate Rick Santorum, center, arrives to the Hilton Coliseum at Iowa State University, to address the crowd assembled for the Ames Straw Poll in Ames, Iowa.  (Photo By Tom Williams/Roll Call)

UNITED STATES - AUGUST 13: Republican presidential candidate Rick Santorum, center, arrives to the Hilton Coliseum at Iowa State University, to address the crowd assembled for the Ames Straw Poll in Ames, Iowa. (Photo By Tom Williams/Roll Call)

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