January 16, 2020
Rep. Liz Cheney of Wyoming will not run for the state's open U.S. Senate seat this year. Cheney will remain in the U.S. House where she has experienced a rapid rise through the GOP ranks.
Sen. Mike Enzi announced last year that he would not seek a 5th term this year. Despite Cheney's decision, Republicans are heavily favored to retain the seat. The frontrunner for the GOP nomination appears to be former Rep. Cynthia Lummis, who held the state's at-large congressional seat for four terms before retiring in 2016.
Separately, Sabato's Crystal Ball updated two Senate ratings for 2020. They moved New Hampshire from Leans to Likely Democratic, while Virginia goes from Likely to Safe Democratic. We've updated their interactive map to reflect these changes.