Vice President Joe Biden greets supporters during a campaign stop at Renaissance High School, Wednesday, Aug. 22, 2012, in Detroit. (AP Photo/Paul Sancya)

Associated Press
Vice President Joe Biden greets supporters during a campaign stop at Renaissance High School, Wednesday, Aug. 22, 2012, in Detroit. (AP Photo/Paul Sancya)
Vice President Joe Biden greets supporters during a campaign stop at Renaissance High School, Wednesday, Aug. 22, 2012, in Detroit. (AP Photo/Paul Sancya)
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