2024 race briefing
Bernie Sanders is the junior U.S. senator from Vermont, serving since 2007. He caucuses with Senate Democrats as an Independent.
Wikipedia records him as a founder of the Congressional Progressive Caucus and as a Democratic presidential candidate in 2016 and 2020. He is the longest-serving Independent in congressional history.
Source: Wikipedia (CC BY-SA) https://en.wikipedia.org/wiki/Bernie_Sanders