PHOTOS: BARACK OBAMA endorsed by AL GORE at Joe Louis Arena in Detroit, Michigan [View All]

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Democratic presidential candidate Barack Obama and former Vice President Al Gore hug each other during a campaign stop at Joe Louis Arena in Detroit, Michigan June 16, 2008.
(Rebecca Cook/Reuters)


Former U.S. Vice President Al Gore (L), Presumptive U.S. Democratic presidential candidate Senator Barack Obama (D-IL), and Michigan Governor Jennifer Granholm acknowledge supporters during a campaign stop at Joe Louis Arena in Detroit, Michigan, June 16, 2008. Gore announced his endorsement of Obama tonight. REUTERS/Rebecca Cook


Democratic presidential candidate Sen. Barack Obama, D-Ill., right, waves with former Vice President Al Gore at the Joe Lewis Arena in Detroit, Monday, June 16, 2008.
(AP Photo/Alex Brandon)


Democratic presidential candidate Sen. Barack Obama, D-Ill., left, and former Vice President Al Gore wave to the audience at Joe Louis Arena in Detroit, Monday, June 16, 2008. Gore announced his endorsement of Obama. (AP Photo/Paul Sancya)


Democratic presidential candidate Barack Obama and former Vice President Al Gore wave to the audience during a campaign stop at Joe Louis Arena in Detroit, Michigan June 16, 2008. (Rebecca Cook/Reuters)


Democratic presidential candidate Sen. Barack Obama, D-Ill., left, waves with former Vice President Al Gore at the Joe Lewis Arena in Detroit, Monday, June 16, 2008.
(AP Photo/Alex Brandon)


Democratic presidential candidate Sen. Barack Obama, D-Ill., speaks as former Vice President Al Gore, left, claps at Joe Louis Arena in Detroit, Monday, June 16, 2008. Gore announced his endorsement of Obama. (AP Photo/Paul Sancya)


Democratic presidential candidate Sen. Barack Obama, D-Ill., right, speaks as former Vice President Al Gore claps at Joe Louis Arena in Detroit, Monday, June 16, 2008. Gore announced his endorsement of Obama.
(AP Photo/Paul Sancya)


Democratic presidential candidate Sen. Barack Obama, D-Ill., shakes hands after speaking at the Joe Lewis Arena in Detroit, Monday, June 16, 2008.
(AP Photo/Alex Brandon)


Democratic presidential candidate Sen. Barack Obama, D-Ill., center, signs a shirt with the help of staff members Reggie Love, left and Marvin Nicholson after speaking at the Joe Lewis Arena in Detroit, Monday, June 16, 2008.
(AP Photo/Alex Brandon)


Democratic presidential candidate Sen. Barack Obama, D-Ill., signs books after speaking at the Joe Lewis Arena in Detroit, Monday, June 16, 2008.
(AP Photo/Alex Brandon)