Jim Desmond switches congressional bid to redrawn 48th District as Darrell Issa exits reelection race

A late filing shift ahead of the primary reshapes a key San Diego–Riverside contest

San Diego County Supervisor Jim Desmond has moved his 2026 congressional campaign into California’s newly configured 48th Congressional District, a change that comes as Rep. Darrell Issa is no longer expected to seek another term. The shift adds momentum to a race already drawing heightened attention because the district lines were recently redrawn and the seat is viewed by both parties as more competitive than in past cycles.

State election calendars set the candidate filing window for the June 2, 2026 statewide primary to close on March 6, 2026, with limited extensions available in specific circumstances. Desmond’s paperwork reflected a switch from a neighboring congressional bid into the 48th District shortly before that deadline, placing him into the district that has been represented by Issa in recent Congresses.

Issa’s expected departure opens an incumbent-free contest

Issa, a veteran Republican lawmaker with decades of prior service in the House, had faced a changed political landscape after new district boundaries were adopted for the 2026 cycle. In the days leading up to the filing deadline, public signals and campaign activity intensified speculation about his intentions. By March 6–7, 2026, multiple reports indicated that Issa had decided against running for reelection, creating the prospect of an open-seat race in the 48th District.

Open seats often trigger rapid candidate repositioning because the advantages of incumbency—name recognition, fundraising networks, and established voter contact operations—no longer shape the matchup the same way. Desmond’s shift places a sitting county supervisor into a contest that is expected to draw significant outside spending and high voter interest.

Why the 48th District is drawing national attention

The 48th District’s competitiveness is closely tied to the broader redistricting fight that unfolded across states ahead of the 2026 midterms. California’s revised congressional map, adopted by voters in 2025, has been central to that dispute and has been followed by litigation at the federal level. The result is a district environment where candidate decisions and party strategy are unusually sensitive to both political and legal developments.

What happens next

• The June 2, 2026 primary will determine which candidates advance under California’s top-two system.

• Official statewide candidate lists and ballot details are expected to be finalized and published on the standard schedule after the filing period closes.

• With Issa not expected to be on the ballot, the contest will center on which candidates can consolidate party support while appealing to the district’s altered electorate.

In races shaped by redistricting and open seats, early organizational strength—fundraising, endorsements, and field operations—often becomes decisive well before voters receive their ballots.

Desmond’s late move into the 48th District ensures that the coming weeks will be defined by rapid coalition-building and intensified competition, as campaigns recalibrate to a seat that has suddenly become both open and closely watched.