Montana Gov. Steve Bullock announces 2020 run

The big picture: As another moderate white guy — the 4th male candidate with a last name starting with "B" — with little name recognition and a comparably late campaign start, Bullock faces an uphill battle to distinguish himself from the pack.

Themes from Bullock's 3-minute announcement video:

• Bipartisanship: He emphasizes that "as a Democratic governor from a state Trump won by 20 points, I don't have the luxury of just talking to the people who agree with me."
• Fighting corruption: "Today we see evidence of a corrupt system all across America, a government that serves campaign money, not the people," Bullock says, pointing to his fight to ban dark money in elections after the Citizens' United v. FEC ruling in 2010.
• Humble beginnings: Bullock talks about being raised by a single mother in a family that struggled to get by.

What's next: Bullock will host a campaign launch rally on Tuesday at Helena High School in Montana. Then he'll begin an eight-stop swing to Iowa through this weekend.

Go deeper: Keep track of the 2020 candidates with our election graphic