The race for the 2020 Democratic nomination: Who's in and who's out.

Liz Johnstone and Jeremia Kimelman and Joe Murphy

First it was challengers "taking a look at," "thinking about" and "not ruling out" a White House bid. Now the field of people who want President Donald Trump's job has shrunk about as much as it will shrink.

Here's a timeline of who has run and who is still running for president among the field of Democratic candidates.

Follow our 2020 election coverage here, and read our latest coverage of each of the Democratic presidential candidates.