Less than a week after he announced he was running for president, Joe Biden is now in the lead in our 2020 endorsement tracker. In the video above, we explain what Biden’s geographically diverse set of endorsements can tell us about the state of the Democratic primary race.
Tony Chow is a video producer for FiveThirtyEight. @tonyhkchow
Sarah Frostenson is FiveThirtyEight’s former politics editor. @sfrostenson