The sprawling Democratic field features candidates ranging in age from 37 to 89; liberals and moderates; senators, governors and mayors; and an unprecedented number of women and minorities.
Democrats view the upcoming election as a must-win, and they’re looking to nominate someone who is their best hope to beat President Donald Trump.
Here are the candidates:
Current status: Formally announced
Best known for: A scorching speech slamming Republican Sen. Ted Cruz of Texas during the recent government shutdown, then publicly announcing that he had prostate cancer in March.
Biggest strength: Bennet is viewed as a wonky, issue-oriented pragmatist who has won tough campaigns, which could be a winning combination for Democratic voters who don't want to veer too far left but are eager to beat Trump.
Biggest weakness: Bennet is not as well known as many other senators competing for the Democratic nomination and has no natural base.