Montana Gov. Steve Bullock to run for Senate

Montana Gov. Steve Bullock, a former 2020 Democratic presidential candidate, announced Monday that he will run for Senate in 2020.

Why it matters: Bullock, a popular moderate in the state, will try to unseat first-term Republican Sen. Steve Daines, as Democrats attempt to gain back control of the Senate in November — which will require them to flip four seats to gain a simple majority.

Go deeper: These Senate seats are up for election in 2020