He got his start in government as a small-town mayor, decades before his 2016 and 2020 campaigns. Here's everything to know about the Democratic socialist senator. AdvertisementBernie Sanders is known today as perhaps the most important leader on the American left. In 2020, Sanders ran again, ultimately coming in second to now-President Joe Biden in the primary. Who Sanders is today — and what he's fighting forSince his 2020 campaign, Sanders has assumed a more institutional role in the United States Senate.

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