Republican presidential candidate Herman Cain shakes hands with supporters during the "Energy Independence Day Tea Party" rally on Independence Mall in Philadelphia, on Monday July 4, 2011. (AP Photo/Joseph Kaczmarek)

Associated Press
Republican presidential candidate Herman Cain shakes hands with supporters during the "Energy Independence Day Tea Party" rally on Independence Mall in Philadelphia, on Monday July 4, 2011. (AP Photo/Joseph Kaczmarek)
Republican presidential candidate Herman Cain shakes hands with supporters during the "Energy Independence Day Tea Party" rally on Independence Mall in Philadelphia, on Monday July 4, 2011. (AP Photo/Joseph Kaczmarek)
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