Voting is underway in South Carolina, the first Southern state to weigh in on the race for the Democratic presidential nomination. And for former Vice President Joe Biden – a victory is essential as the future of his White House bid is on the line. While Sen. Bernie Sanders of Vermont doesn’t have to win in South Carolina, he’d like to make it three wins in a row – after narrowly winning in New Hampshire and routing his rivals in last weekend’s Nevada caucuses.
