California primary reshaped by House map. What it means for key races

• California's June 2 primary election will be the first under new congressional maps drawn due to Proposition 50.
• The new districts, approved by voters in 2025, are expected to create more Democratic-leaning seats and several same-party runoffs.
• Key races to watch include open seats, newly competitive districts, and intra-party battles in safely Democratic areas.

California voters head to the polls June 2 in a primary election that could reshape the state’s congressional delegation — and potentially the balance of power in Washington.

This year’s races are uniquely shaped by Proposition 50, a voter-approved measure that redrew California’s congressional districts and is already influencing who advances under the state’s top-two primary system.

Under that system, the top two vote-getters — regardless of party — move on to the November general election. In several districts, that could mean Democrat-vs.-Democrat matchups in the fall.

Here are some interesting races to watch as results come in statewide.

(Check back on primary night for election night returns on the races.)

How new congressional maps are changing key races after Prop. 50

California voters approved Proposition 50 in November 2025, temporarily handing redistricting power to the state Legislature and replacing maps drawn by an independent commission.

The measure is designed to be in effect from 2026 through 2030.

Supporters said the new maps would counter Republican-led redistricting efforts in other states, while critics warned it set a precedent for partisan mapmaking.

Key impacts already visible in this primary:

• Several Republican-held districts have been redrawn to favor Democrats
• Geographic boundaries have shifted, changing voter bases
• Multiple districts now lean heavily toward one party, increasing the odds of same-party runoffs

Political analysts say the new maps could add multiple Democratic-leaning seats — raising the stakes for both parties in California and nationwide.

District 3 race to watch in the Sacramento suburbs

The newly redrawn 3rd Congressional District spans suburban and exurban communities in Sacramento, with new lines shifting the seat into play for Democrats. With GOP Rep. Kevin Kiley running in a different district, the seat is open. Veteran Sacramento-area congressman Ami Bera — seeking to remain in Congress after redistricting — brings strong fundraising and name recognition, making him a top Democratic contender. He faces a field that includes Nevada County Supervisor Heidi Hall and Army veteran Chris Bennett.

District 4 wine country race tilts more Democratic

The 4th District, spanning portions of Northern California’s wine country and college‑town suburb Davis, is expected to lean more Democratic under the new map but still features a competitive primary.

Longtime Rep. Mike Thompson, a moderate Democrat first elected in 1998, is seeking reelection and faces intraparty challenges from Democrat Eric Jones, a businessman and nonprofit executive, and Trevor Merrell, a youth commissioner and progressive organizer.

Republicans have a sizeable field — including Sharon Brown, Mandy Ghusar, and business owner Ray Riehle — but face a more difficult structural path under the new district lines, making it possible that Democrats secure a top‑two general‑election slot.

District 6 race puts Kevin Kiley to the test as an independent

Rep. Kevin Kiley, who left the Republican Party in 2026 and is now running as an independent while continuing to caucus with House Republicans, faces one of the cycle’s most closely watched contests.

The newly drawn district is considered more competitive for Democrats than his previous seat. Kiley faces a crowded field that includes one Republican and five prominent Democrats, among them former state Sen. Richard Pan, a pediatrician, and Sacramento County District Attorney Thien Ho. Kiley’s path to a top-two finish hinges on consolidating conservative and independent voters while Democrats split their vote.

District 7 race could lead to a Democrat vs. Democrat runoff

Longtime Democratic Rep. Doris Matsui faces a serious primary challenge from Sacramento City Councilmember Mai Vang and several other Democrats. Matsui has represented the Sacramento‑area district since 2005. Vang, also a Democrat who represents South Sacramento on the City Council, has positioned herself as a younger, more progressive challenger and has emerged as the top challenger in the race. The district — centered in Sacramento and surrounding communities including Elk Grove and parts of the Sierra foothills — is heavily Democratic, making a top-two Democrat runoff in November likely.

District 11 race opens after Nancy Pelosi retirement

The 11th District, which encompasses most of San Francisco, remains strongly Democratic under the new boundaries and is rated “safe Democratic,” with roughly two‑thirds of registered voters aligned with the party. With Speaker Emerita Nancy Pelosi retiring after nearly four decades in Congress, this is an open seat for the first time since the 1980s, and the real competition is within the Democratic field rather than between the parties.

Three Democrats have emerged as the leading contenders:

• State Sen. Scott Wiener, who has the state party and local Democratic endorsements
• San Francisco Supervisor Connie Chan, backed by organized labor and Pelosi
• Former Alexandria Ocasio‑Cortez campaign manager Saikat Chakrabarti, who is partially self‑funding

Multiple other Democrats and a handful of Republican and independent candidates are also on the ballot, but the top‑two general election is widely expected to feature two Democrats.

District 13 remains a tight Central Valley battleground

The 13th District remains one of California’s most competitive House seats after Democrat Adam Gray narrowly flipped it in 2024.

Republicans are fielding two major candidates:

• Kevin Lincoln, a Marine veteran and former Stockton mayor with strong name recognition in the northern portion of the district
• Vin Kruttiventi, a businessman with a background in technology

Democrats are working to consolidate support behind Gray, while Republican prospects may hinge on name recognition.

District 22 heading to another Central Valley battleground seat

The 22nd District remains a key swing seat in the Central Valley. Republican incumbent David Valadao is seeking reelection in a district that was one of the most competitive and expensive in the state.

On the Democratic side, two leading candidates are competing:

• Jasmeet Bains, a physician and State Assembly member for the 35th district, emphasizing health care access and rural services
• Randy Villegas, a community college instructor and school board member from Visalia, focused on labor issues and economic inequality

Democratic Party leaders have backed Bains, highlighting a broader intraparty divide. The outcome of the primary will determine which Democrat advances to November in a district where general-election margins are expected to be narrow.

District 48 shifts toward Democrats after redistricting, still competitive

Once part of a Republican‑held stronghold represented by Rep. Darrell Issa, the newly redrawn 48th District in Southern California now tilts Democratic after Proposition 50 reshaped its boundaries and shifted voter registration. Issa opted to retire rather than run again in the new, more Democratic‑friendly version of the district, and has backed San Diego County Supervisor Jim Desmond as the GOP’s preferred successor.

The biggest question is which Democrat can advance to November in a crowded field that includes San Diego City Councilmember Marni von Wilpert, Ammar Campa‑Najjar, and other well‑funded contenders.