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. Sanders Urges Progressives to Keep Agenda Alive with Vote for Biden Katherine Gypson WASHINGTON - For the second time in four years, progressive voters' hopes to elevate Senator Bernie Sanders of Vermont to the top of the Democratic ticket were dashed this spring, when Sanders' call for a social revolution and Medicare for All fell flat, and former Vice President Joe Biden surged to victory in the race for the presidential nomination. In 2016, many of these same liberal Democrats decided to sit out the general election after Hillary Clinton edged out Sanders for the Democratic presidential nomination -- and Sanders appeared half-hearted in urging them to back Clinton at the polls. But Sanders made a compelling argument Monday night -- at the start of the 2020 Democratic National Convention -- that progressives' issues and policies will live on if they help the more moderate Biden defeat President Donald Trump in the November3 general election. "The future of our democracy is at stake," Sanders said in a live speech from his home in Burlington, Vermont. He added, "Many of the ideas we fought for, that just a few years ago were considered radical, are now mainstream." The appeal for party unity was a departure for the self-styled democratic socialist who was the last remaining primary rival to Biden earlier this year. Sanders has not always advocated loyalty to the Democratic party, with whom he usually caucuses in the U.S. Senate. Progressive wing He is seen foremost as the leader of the progressive wing of the Democratic Party, the group of liberal voters who support social reform policies intended to help working Americans, including universal health care, free college tuition, a higher minimum wage and a raft of other social benefits. Sanders rested his appeal to his supporters on the idea that defeating Trump is key to keeping progressive causes in the mainstream discussion. .