Democratic party White House hopeful Vermont Senator Bernie Sanders adresses supporters at a rally in Columbia, South Carolina, on February 28, 2020. - Sanders is battling moderate rivals including former vice president Joe Biden and rising challenger Mike Bloomberg, the billionaire former mayor of New York, to see who faces President Donald Trump in November's election. | JIM WATSON/AFP via Getty Images
Sen. Bernie Sanders, I-Vt., a Democratic Socialist who ran a surprisingly powerful primary challenge to Hillary Clinton in 2016, finished Super Tuesday in a strong second to Biden.