Via Washington Post:
Sanders, the independent senator from Vermont whose 2016 presidential campaign grew from a left-wing insurgency to a major political force, will seek the Democratic Party's nomination again in 2020.
After Donald Trump became president, Sanders began to take a bigger role shaping the party, reintroducing ambitious bills, starting with "Medicare-for-all" legislation. Those ideas have gained popularity since his 2016 run, but he now faces a diverse field of candidates, many of whom share his policy positions if not his democratic socialist beliefs.