In the 2016 presidential campaign, Vermont Senator Bernie Sanders sought the Democratic Party's nomination in a field of six major candidates and was the runner up with 46% of the pledged delegates behind former Secretary of State Hillary Clinton, who won the contest with 54%. Sanders, the junior United States senator and former Representative from Vermont, began with an informal announcement on April 30, 2015, and a formal announcement that he planned to seek the Democratic Party's nomination for President of the United States on May 26, 2015, in Burlington, Vermont. Sanders had been considered a potential candidate for president since at least September 2014. Though he had previously run as an independent, he routinely caucused with the Democratic Party, as many of his views align with Democrats. Running as a Democrat made it easier to participate in debates and get his name on state ballots.

Bernard Sanders is an American politician and activist who is the senior United States senator from Vermont. Sanders is the longest-serving independent in U.S. congressional history but has a close relationship with the Democratic Party, having caucused with House and Senate Democrats for most of his congressional career and sought the party's presidential nomination in 2016 and 2020, coming second in both campaigns. He is often seen as a leader of the U.S. progressive movement.