Tom Steyer

The billionaire climate-change activist had staked his campaign on doing well in South Carolina but ended with a disappointing finish on Saturday.

Steyer, the billionaire hedge fund invester and climate change activist, is betting everything on South Carolina. He'll learn Saturday if it paid off.

Sen. Bernie Sanders won narrowly, but can he expand his base? Pete Buttigieg again did well, but in another largely white state. And the story of the night was Sen. Amy Klobuchar's third-place finish.