KINGSTREE, SC - JANUARY 24:  Presidential candidate, U.S. Sen. Barack Obama (D-IL), smiles after being interrupted by a public address system in a high school January 24, 2008 in Kingstree, South Carolina. Obama is keeping a furious shedule ahead of the South Carolina Democratic primary on January 26. Getty Images logo Getty Images 52 months ago

KINGSTREE, SC - JANUARY 24: Presidential candidate, U.S. Sen. Barack Obama (D-IL), smiles after being interrupted by a public address system in a high school January 24, 2008 in Kingstree, South Carolina. Obama is keeping a furious shedule ahead of the South Carolina Democratic primary on January 26.