In the last week, four U.S. Representatives—three Republicans and one Democrat—announced they would not seek re-election in 2020. Bill Flores (TX-17), Susan Davis (CA-53), and Jim Sensenbrenner (WI-5) are retiring from political office, while Roger Marshall (KS-1) is running for U.S. Senate. To date, four Senators (three Republicans and one Democrat) and 19 Representatives (15 Republicans and four Democrats) are not running for re-election.
As of Sept. 9, 232 candidates are filed with the Federal Elections Commission (FEC) to run for U.S. Senate in 2020. Of those, 206—108 Democrats and 98 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.
1,385 candidates are filed with the FEC to run for U.S. House in 2020. Of those, 1,301—686 Democrats and 615 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, 20120, 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.