A supporter holds a photograph of Vice President Joe Biden at the Metro Detroit AFL-CIO Labor Day Rally, Monday, Sept. 3, 2012, in Detroit. (AP Photo/Carolyn Kaster)

 

              A supporter holds a photograph of Vice President Joe Biden at the Metro Detroit AFL-CIO Labor Day Rally, Monday, Sept. 3, 2012, in Detroit. (AP Photo/Carolyn Kaster)
A supporter holds a photograph of Vice President Joe Biden at the Metro Detroit AFL-CIO Labor Day Rally, Monday, Sept. 3, 2012, in Detroit. (AP Photo/Carolyn Kaster)