The sprawling Democratic field features candidates ranging from 37 to 77 years old; 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 23 candidates:
Bill de Blasio
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Biden has attempted to thwart the president with a frontal assault on Trump's morality, particularly his defense of some of those at the 2017 march of white nationalists in Charlottesville, Virginia.
How many Democratic candidates were there in 1976? One historian put the number at 17, though it depends on how you count them. Let's just say the race was remarkably fluid right up until to the last primary.
Some say the Democratic Party needs to do better at talking to people in small towns. Others say that's a waste of time.