May 4, 2019
Wyoming Sen. Mike Enzi announced Saturday that he will not run for reelection in 2020. Enzi, 75, was first elected to the Senate in 1996. He has been returned to the Senate for three additional terms, getting over 70% of the vote each time.
Possible replacements could include former Gov. Matt Mead or Rep. Liz Cheney. In July 2013, Cheney announced she would challenge Enzi for the Republican nomination. After failing to gain significant party support, she withdrew in early 2014. Enzi would easily defeat four other challengers on the way to winning a fourth and final term in November that year. Cheney went on to win the state's at-large seat in the U.S. House in November, 2016.
Enzi becomes the fourth Senator to announce a 2020 retirement. His Republican colleagues Lamar Alexander (TN) and Pat Roberts (KS), as well as Democrat Tom Udall (NM) will be leaving. All these seats are seen as safe for the incumbent party.
Kansas Republicans opted for nominees with better general election prospects, while a dynastic Missouri Democratic congressman was defeated
After a two week break, August 4 brings us primaries in Arizona, Kansas, Michigan, Missouri and Washington
Biden is likely to prevail here, but a competitive electoral vote available in the state's 2nd congressional district - won by Trump in 2016 - will draw considerable attention.
See how often a state votes with the election winner and also which states most frequently put the winner across the 270 electoral vote threshold.
Reliably Republican at the presidential level through most of the 20th century, it has voted Democratic since 2008 and looks fairly safe for Joe Biden in 2020