Vice President Joe Biden points to his head as he greets supporters after he addressed a grassroots rally, Tuesday, Aug. 21, 2012, in Minneapolis. (AP Photo/Jim Mone)

 

              Vice President Joe Biden points to his head as he greets supporters after he addressed a grassroots rally, Tuesday, Aug. 21, 2012, in Minneapolis. (AP Photo/Jim Mone)
Vice President Joe Biden points to his head as he greets supporters after he addressed a grassroots rally, Tuesday, Aug. 21, 2012, in Minneapolis. (AP Photo/Jim Mone)