Why It Matters

The congressional seat that Darrell Issa held for more than two decades is now a wide-open battleground in today's June 1 primary. The CA-48 district's campaign funding landscape tells a story of billionaires, labor unions, pro-Israel donors, and ideological warriors all betting heavily on who controls a newly redrawn slice of Southern California that could help determine the balance of power in the House.

Issa, the 22-year Republican veteran who built his fortune manufacturing car alarms, and with his political brand by tormenting Democratic presidents, announced in March that he would not seek re-election. His retirement set off the most expensive and chaotic congressional primary in the San Diego region in years. The result is a race with more than a dozen candidates, multiple super PACs, and well over $3 million in outside spending, most of it aimed at a single Democratic candidate.

What the Money Reveals About the Seat

California's 48th Congressional District doesn't look much any more like the seat Issa won in 2020 and 2022. Proposition 50, the redistricting ballot measure championed by Gov. Gavin Newsom that passed in November 2025, carved Issa's home out of the new district and shifted the boundaries to include Palm Springs, Hemet, and a large swath of Riverside County. The result was a seat that Kamala Harris narrowly carried in 2024, where Democrats hold a registration edge of roughly four to six points, and where Cook Political Report rates the November general election as a top Democratic pickup opportunity. The California 48th congressional race donations reflect a national Democratic calculation that this seat is winnable, and the Republican calculation that it must be held.

The Republican Lane

Jim Desmond, 70, is the consolidating force on the Republican side. A San Diego County Supervisor, Navy veteran, and former commercial airline pilot, Desmond pivoted from a planned run in the neighboring CA-49 district to CA-48 after Issa announced his retirement. He quickly locked up the two endorsements that matter most in a California Republican primary, namely Darrell Issa's blessing and a Trump endorsement in April, that typically drives a surge in small-dollar national donations.

Jim Desmond's fundraising has been steady if not spectacular. FEC filings through mid-May show he raised approximately $1.35 million for the cycle, ranking him among the top open-seat House candidates nationally with roughly $276,000 coming in during the first quarter of 2026. His PAC contributions total around $20,000, a relatively modest number that reflects both his status as the lone credible Republican and the reality that major institutional money tends to wait for the general election.

The more telling financial signal around Desmond is the outside spending against him. A super PAC called the 48th Accountability Project has spent approximately $67,000 in opposition to Desmond. It's a small but notable figure suggesting that some interests, likely aligned with the Democratic side, are attempting to soften his standing before November.

Desmond's pitch to voters centers on border security, housing affordability, and cutting Washington gridlock. These are themes calibrated for a district that leans Democratic on paper but contains large working-class Latino communities in Hemet and Escondido; a heavy senior population; and a significant military and veteran presence that has historically tilted Republican. His path to victory in November, if he advances in the primary, runs through those communities and through the college-educated suburban voters in Temecula who have been drifting toward Democrats since 2016.

The Democratic Money War

The most explosive financial story in this race is the super PAC arms race between the two leading Democratic candidates. It's a battle that has drawn in Jeff Bezos, the family of Qualcomm's co-founder, a major pro-Israel PAC, labor unions and EMILY's List. That's made campaign funding for this district one of the most-watched campaign finance stories of the 2026 cycle so far.

The Institutional Choice

Marni von Wilpert, 43, is a San Diego city council member, former federal labor attorney, Peace Corps alumna, and the daughter of an immigrant Army veteran. She received 68.8 percent of the vote in the San Diego Democratic Party's pre-endorsement process, a lopsided margin that reflects her dominance among local party insiders, labor unions, and the national Democratic establishment.

Her fundraising matches that institutional support. FEC filings show von Wilpert raised $520,715 in the first quarter of 2026 alone, the top figure among all candidates in the field for that period, and she's crossed $1.26 million for the full cycle to date. EMILY's List has backed her with both an endorsement and its fundraising network. Major labor unions have contributed through PAC channels.

The most significant financial force behind von Wilpert, however, is the Democratic Majority for Israel PAC (DMFI), which has spent more than $750,000 in independent expenditures in a combination of ads supporting her as well as a sustained attack campaign against her primary rival, Ammar Campa-Najjar. DMFI's spending has made it the dominant outside force in the Democratic primary, and it has generated considerable controversy given Campa-Najjar's Palestinian heritage.

The Outsider With Billionaire Backing

Ammar Campa-Najjar, 37, is running for Congress for the fourth time. He came within 4,000 votes of winning the old CA-50 district in 2018, lost again in 2020, ran unsuccessfully for Chula Vista mayor in 2022, and has now repositioned himself in the redrawn CA-48 district. He has since joined the Navy Reserve and taken a teaching post at Georgetown University, moves that appear designed to address the "perennial candidate" narrative that has dogged him.

His campaign has raised approximately $1.26 million for the cycle, matching von Wilpert's total, but his fundraising profile is strikingly different. He received only 14.3 percent in the San Diego Democratic Party's pre-endorsement vote, signaling deep skepticism among local insiders. His institutional support is thin. What he has instead is a super PAC.

The Serving CA super PAC, formed specifically to support Campa-Najjar, has raised approximately $1.2 million and deployed it aggressively, both in ads boosting his candidacy and in attacks on von Wilpert. The committee's primary funders are the Bezos family (through a PAC associated with Jeff Bezos and his parents that has given the majority of Serving CA's funding) and Irwin Jacobs, the Qualcomm co-founder whose granddaughter is Campa-Najjar's partner. The With Honor Fund, a PAC supporting veteran candidates, contributed $250,000 to Serving CA.

Campa-Najjar has framed the DMFI spending against him explicitly in terms of his Palestinian heritage, writing in a Times of San Diego op-ed that "a pro-Israel PAC is spending $1 million to attack me and split the vote." DMFI has countered that its opposition is rooted in his policy positions, not his background.

This adds up to more than $3.4 million in outside spending that has been directed against Campa-Najjar as of the eve of the primary, according to FEC filings, which is an extraordinary sum for a House primary race.

What Donors Want

DMFI wants a pro-Israel Democrat in a competitive seat, and it has concluded that von Wilpert is a safer bet than Campa-Najjar on Middle East policy. Its spending pattern, which is heavy on anti-Campa-Najjar attack ads, reflects an effort to consolidate the Democratic primary field around a single candidate before a vote-splitting trap closes.

The Bezos-Jacobs investment in Serving CA is harder to read ideologically. The With Honor Fund's participation suggests a genuine interest in Campa-Najjar's military service as a credential. The family connection through Irwin Jacobs adds a personal dimension. But the scale of the spending, namely $1.2 million in a primary, suggests these donors believe Campa-Najjar is the stronger general-election candidate, a judgment that most Democratic strategists dispute given his history of losses.

Labor unions and EMILY's List are betting on electability. von Wilpert's governing record as a city council member, her San Diego roots, and her profile as a moderate-to-progressive Democrat with broad institutional support make her, in their calculation, the candidate most likely to hold a November lead in this district.

On the Republican side, Trump and Issa's endorsements of Desmond reflect the party's judgment that a locally known, credentialed candidate with a military background gives Republicans their best shot at holding a seat that the new district lines have made genuinely competitive.

The Issa Legacy

For more than two decades, Darrell Issa shaped this corner of Southern California's representation through a combination of personal wealth, aggressive oversight work, and niche policy expertise. He chaired the House Oversight Committee under Obama, launched the Fast and Furious and Benghazi investigations, and built a distinctive legislative portfolio around patent law, intellectual property, and, in recent years, artificial intelligence. His No Censors on our Shores Act, making foreign government officials who censored American citizens inadmissible to the United States, passed out of the Judiciary Committee in February 2025. His JUDGES Act, creating 64 new federal district court judgeships, passed committee in March 2025.

His district, under the old lines, wanted a fighter, specifically someone willing to use the levers of congressional oversight to hold executive power accountable. Issa delivered that, particularly during the Obama years, even if his investigations rarely produced the definitive revelations he promised. Under the new lines, the district's voters are more diverse, more suburban, and more likely to prioritize cost of living, housing, and healthcare than the oversight-and-accountability brand that Issa perfected.

What Comes Next

Forecasters expect Desmond to clear the primary comfortably as the lone major Republican. The real question is whether von Wilpert or Campa-Najjar, or both, advance to November alongside him.

If Democrats fail to consolidate and two Republicans advance, the seat becomes dramatically harder to flip. If von Wilpert advances alone, or alongside Campa-Najjar, Democrats have a credible path in November in a district that, by registration and recent presidential performance, should be theirs to win. An enormous amount of money has been spent trying to determine which Democrat gets the chance to run, and the question is whether the Democratic infighting has so fractured the primary vote that the choice gets made for them.

Sources: FEC candidate filings; San Diego Union-Tribune; Times of San Diego; Voice of San Diego; KPBS; DMFI PAC; legislative data via Legis1.