U.S. Democratic Presidential candidate Barack Obama greets supporters during a rally in Birmingham, Alabama, January 27, 2008. REUTERS/Jason Reed
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., speaks during a rally in Birmingham, Ala., Sunday, Jan. 27, 2008. (AP Photo/Charles Rex Arbogast)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., addresses a crowd of more than 9,000 during a rally in Birmingham, Ala., Sunday, Jan. 27, 2008. (AP Photo/Charles Rex Arbogast)
U.S. Democratic Presidential candidate Barack Obama reaches out to supporters during a rally in Birmingham, Alabama, January 27, 2008. REUTERS/Jason Reed
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., addresses a crowd of more than 9,000 during a rally in Birmingham, Ala., Sunday, Jan. 27, 2008. (AP Photo/Charles Rex Arbogast)
U.S. Democratic Presidential candidate Barack Obama (L) is followed by secret service agents as he leaves a rally in Birmingham, Alabama, January 27, 2008. REUTERS/Jason Reed