The race for the 2020 Democratic nomination is on. Who's in, and, increasingly, who's out.

The field is starting to shrink. Here's a timeline.
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By Liz Johnstone and Jeremia Kimelman

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 is at the start of its inevitable shrinkage.

Here’s a timeline of the Democratic presidential candidate field.

Follow our 2020 election coverage here.

Joe Murphy contributed.