COLUMBIA, S.C. — 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/AP. More here.

Question: Why is Hillary Clinton having such a rough time with Barack Obama?

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