COLUMBIA, S.C. (AP) -- Barack Obama routed Hillary Rodham Clinton in the racially-charged South Carolina primary Saturday night, regaining campaign momentum in the prelude to a Feb. 5 coast-to-coast competition for more than 1,600 Democratic National Convention delegates.

Former Sen. John Edwards of North Carolina was running third, a sharp setback in the state where he was born and scored a primary victory in his first presidential campaign four years ago.

The Associated Press made its call based on surveys of voters as they left the polls.