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UNITED STATES - OCTOBER 20: Pat Toomey and Joe Sestak supporters wave signs at passing cars before the start of the Pennsylvania Senate debate between the two candidates in Philadelphia on Wednesday, Oct. 20, 2010. (Photo By Bill Clark/Roll Call via Getty Images)

UNITED STATES - OCTOBER 20: Pat Toomey and Joe Sestak supporters wave signs at passing cars before the start of the Pennsylvania Senate debate between the two candidates in Philadelphia on Wednesday, Oct. 20, 2010. (Photo By Bill Clark/Roll Call via Getty Images)

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