Vice President Joe Biden greets supporters as one hands him a copy of the book "Joe Biden" after he addressed a grassroots rally, Tuesday, Aug. 21, 2012, in Minneapolis. (AP Photo/Jim Mone)

Associated Press
Vice President Joe Biden greets supporters as one hands him a copy of the book "Joe Biden" after he addressed a grassroots rally, Tuesday, Aug. 21, 2012, in Minneapolis. (AP Photo/Jim Mone)
Vice President Joe Biden greets supporters as one hands him a copy of the book "Joe Biden" after he addressed a grassroots rally, Tuesday, Aug. 21, 2012, in Minneapolis. (AP Photo/Jim Mone)
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