In the past week, one member of Congress, Republican Rep. Francis Rooney (FL-19), announced he would not run for re-election in 2020. To date, four Senators (three Republicans and one Democrat) and 24 Representatives (18 Republicans and six Democrats) are not running for re-election. In 2018, 55 total members of Congress—18 Democrats and 37 Republicans—did not seek re-election.
As of October 21, 2019, 271 candidates are filed with the Federal Elections Commission (FEC) to run for U.S. Senate in 2020. Of those, 241—128 Democrats and 113 Republicans—are from one of the two major political parties. In 2018, 527 candidates filed with the FEC to run for U.S. Senate, including 137 Democrats and 240 Republicans.
1,608 candidates are filed with the FEC to run for U.S. House in 2020. Of those, 1,507—765 Democrats and 742 Republicans—are from one of the two major political parties. In 2018, 3,244 candidates filed with the FEC, including 1,566 Democrats and 1,155 Republicans.
On November 3, 2020, 35 Senate seats and all 435 House seats are up for election. Of those Senate seats, 33 are regularly-scheduled elections, one is a special election in Arizona, and another is an expected special election in Georgia. Twelve are Democratic-held seats and 23 are Republican-held seats. In the House, where all the seats are up for election, Democrats currently hold a 235-seat majority.