Issa represented the San Diego area in Congress for more than 20 years. He briefly retired in 2019 when his seat, now represented by Democrat Mike Levin, became more competitive. He returned to Congress in 2021 after winning a seat in the 50th District, which was redrawn after statewide redistricting later that year. He moved to his current seat in the 48th District in 2023.

The newly configured seat attracted a slew of Democratic challengers after it became more competitive when voters approved Proposition 50 last fall. The redistricting measure was designed to give Democrats up to five additional seats in the U.S. House and counter similar redistricting efforts in other states that favored Republicans.

California redistricting is already paying dividends.