On August 4, Arizona, Kansas, Michigan, Missouri, and Washington are holding statewide primaries. Between these five states, 48 congressional seats—45 U.S. House seats and three U.S. Senate seats—are up for election.
Arizona is holding a special election to fill the Senate seat vacated by former Sen. John McCain’s (R) death on August 25, 2018. Martha McSally (R) is the current appointed incumbent, and she is running in the August 4 Republican primary. The winner of the November 3 general election will take office on January 3, 2021, and serve the remaining two years of McCain’s term. Arizona is also holding primary elections for all nine of its U.S. House seats on August 4.
Both Kansas and Michigan are holding congressional primaries for Senate and House seats. In Kansas, elections are being held for the state’s Class II Senate seat currently held by Pat Roberts (R) and all four of the state’s U.S. House seats. Michigan is holding elections for the Class II Senate seat held by Gary Peters (D) and all 14 of its House seats.
Neither Missouri nor Washington has a Senate seat up for election in 2020. Missouri is holding elections for its eight House seats, and Washington is holding elections for its 10 House seats.
The 45 House seats up for election on August 4 represent 10.3% of the 435 total seats in the U.S. House of Representatives, all of which are up for election in 2020. The three Senate seats up for election that day equal 3% of the Senate’s 100 total seats and approximately 8.6% of the 35 Senate seats up for election this year (33 are up for regular election; two are up for special election).
Candidates in all five states are competing to advance to their respective states’ general elections scheduled for November 3, 2020.