Democratic Presidential candidate Barack Obama walks to the stage surrounded by secret service agents during his final rally in Columbia, South Carolina, January 25, 2008, the eve of South Carolina's Presidential Primary. (Jason Reed/Reuters)
Michelle Obama, wife of Democratic presidential hopeful Sen. Barack Obama, D-Ill., greets the crowd at a rally in Columbia, S.C., Friday, Jan. 25, 2008.
(AP Photo/Charles Rex Arbogast)
Democratic Presidential candidate Barack Obama speaks to supporters alongside his wife Michelle during his final rally in Columbia, South Carolina, January 25, 2008, the eve of South Carolina's Presidential Primary. (Jason Reed/Reuters)
Democratic presidential hopeful Sen. Barack Obama, D-Ill., greets the crowd at a rally in Columbia, S.C., Friday, Jan. 25, 2008. (AP Photo/Charles Rex Arbogast)