Over the weekend, Sen. Bernie Sanders, I-Vt., was in the key early primary state of South Carolina. He's been drawing huge crowds around the country in his campaign for the Democratic nomination, but even if he succeeds elsewhere, South Carolina could be a big hurdle.
If Sanders has any hope of beating Hillary Clinton in South Carolina, he'll need black voters. They make up most of the state's Democratic base. But even in the predominantly African-American city of North Charleston, the crowd that showed up to see Sanders was mostly white.