U.S. Senator Mike Enzi (R-Wyo.) announced on May 4 that he would retire at the end of his term in 2020. Enzi was first elected to the Senate in 1996 and previously served in the U.S. House (1991-1996) and the Wyoming House of Representatives (1987-1991). He last won re-election in 2014, defeating his Democratic opponent by 54.8 percentage points.
Enzi is the fourth U.S. senator to announce his retirement ahead of the 2020 elections. Democrat Tom Udall (N.M.) and Republicans Lamar Alexander (Tenn.) and Pat Roberts (Ks.) are also not seeking re-election. Six U.S. House members—three Democrats and three Republicans—have announced that they will not seek re-election or will run for another office. Fifty-five members of Congress did not seek re-election in 2018—37 Republicans and 18 Democrats.
Election forecasters rated Wyoming “Safe Republican” in the 2018 election cycle. Given the state’s partisan lean, the Republican primary in the race to replace Enzi will be important. During the 2018 cycle, Ballotpedia covered 10 battleground U.S. Senate primaries—two for Democratic-held seats and eight for Republican-held seats. The Republican primaries in Arizona and Utah were for seats where no incumbent was running. Three of the primaries (Delaware Democratic primary, Utah Republican primary, and Virginia Republican primary) were in seats that were not rated competitive in the general election.