Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Biden Faces Critical Test in South Carolina as Sanders Continues to Surge VOA News Voters in South Carolina cast ballots Saturday in the Democratic primary, providing a dramatic run-up to next week's crucial Super Tuesday marathon of 14 state primaries. The South Carolina contest offers a handful of candidates another opportunity to slow the surge of Vermont Sen. Bernie Sanders in their quest to derail President Donald Trump's reelection bid in the November general election. Former Vice President Joe Biden, the one-time front-runner who has stumbled badly in the first three primary and caucus contests, needs a win in South Carolina to sustain his campaign. Biden has struggled to raise money and spark enthusiasm among rank-and-file Democrats. .