SAN MATEO COUNTY, CA — The 2026 California election season is officially underway, and for Golden State voters, the June 2 primary brings a host of important decisions across local, state and national races.
It’s a political contest plagued by scandal, partisan infighting, and a lack of clear frontrunners. Beyond the swift rise and fall of Democratic former Rep. Eric Swalwell, who ended his campaign and congressional career amid allegations of sexual assault, the major storyline has been the possibility that two Republican candidates might emerge from the primary as dozens of Democrats divide the vote. In California, the top two vote-getters in the primary — regardless of party preference — advance to the November general election.
Down-ballot, voters will weigh in on congressional races. Thanks largely to the naked gerrymandering of Proposition 50 passed by Golden State voters last year in a rebuke of President Donald Trump, 2026 is shaping up to be a slog for the California GOP, according to the polls. The party currently holds just eight of the state’s 52 congressional seats after the Jan. 6 death of Northern California’s Republican Rep. Doug LaMalfa. According to the Cook Political Report, only four of those eight are solidly Republican heading into the primary.
Closer to home, voters will cast ballots in several local races — from the local Board of Supervisors and County offices to competitive Congressional and State Assembly primaries.
Voters will determine who advances to the November general election, shaping the political landscape of the Peninsula and South Bay for years to come.
The race for the District 2 Board of Supervisors seat in San Mateo County features only the incumbent, Noelia Corzo.
In District 3, incumbent Ray Mueller is challenged by Joaquin Jimenez, a former Half Moon Bay City Council member. A key difference between the candidates is their stance on ousted Sheriff Christina Corpus. Jimenez supported her, while Mueller was a leading figure in her removal.
The District 5 seat is essentially open. Incumbent David Canepa has chosen to run for assessor-county clerk-recorder and chief elections officer instead of seeking re-election to the Board of Supervisors. Filings have not yet clarified who is competing for this now-open seat.
Notably, three of Canepa’s current colleagues on the SMC Board of Supervisors — Jackie Speier, Corzo, and Ray Mueller — endorsed his opponent, Jim Irizarry, in the assessor-clerk race.
Peninsula residents are being asked to choose the County Superintendent of Schools. The candidates who have taken out papers are Chelsea Bonini, a teacher, attorney, and trustee, and Héctor Camacho Jr., a teacher and executive director.
On June 2, 2026, Peninsula and South Bay voters will hold primaries for congressional districts 15 and 16, with the general election on Nov. 3. These races use the new, Democratic-backed district boundaries, which voters approved last November via Proposition 50.
California's 15th Congressional District
This district, which leans heavily Democratic, covers much of San Mateo County, including San Mateo and Redwood City, and the southeastern portion of San Francisco County along the Bay Peninsula. Incumbent Rep. Kevin Mullin, a Democrat first elected in 2022, who previously served a decade in the California State Assembly, is seeking another term.
His challengers are:
California's 16th Congressional District
This district stretches from the coastal communities of Pacifica and Half Moon Bay south through Silicon Valley, taking in Palo Alto, Mountain View, Los Altos, Menlo Park, Woodside, Atherton, Saratoga, Campbell, Los Gatos, and portions of San Jose across San Mateo and Santa Clara counties. Notably, Pacifica was moved into the district under the new Proposition 50 map, shifting the coastal city out of district 15’s boundaries.
Incumbent Rep. Sam Liccardo, the former two-term mayor of San José, who won the seat in 2024 to succeed retiring Rep. Anna Eshoo, faces three challengers:
Five of the nine candidates answered Patch's questions about their key priorities, their professional and political history and the most pressing issues facing the region. Check out the candidate profiles below, listed in the order they appear on the ballot:
These California State Assembly districts include portions of San Mateo County in the upcoming June 2 primary election. The top two finishers in each primary will advance to the Nov. 3 general election.
Assembly District 19
Incumbent Catherine Stefani, a Democrat, is seeking reelection in California's 19th Assembly District, which covers San Francisco and part of San Mateo County. She faces one challenger, Philip Wing, a retired financial advisor running as a Republican.
Assembly District 21
Incumbent Diane Papan, a Democrat and current state Assemblymember, is running for reelection in the 21st Assembly District, which covers portions of San Mateo County. She faces one challenger, Jabra J. Muhawieh, an enrolled agent and businessman running as a Republican.
Assembly District 23
Incumbent Marc Berman, a Democrat and current state Assemblymember, is seeking reelection in the 23rd Assembly District, which covers parts of San Mateo and Santa Clara counties. He faces two Republican challengers: Rick Giorgetti, a businessman, and David G. Johnson, a small business owner.
Measure C is a proposed eight-year special parcel tax for the Redwood City Elementary School District, scheduled to run from July 1, 2026, to June 30, 2034. It is expected to raise about $12.2 million annually, according to an analysis by the County of San Mateo.
The tax rate for developed properties is 17.5 cents per building square foot per year with a maximum annual limit. For undeveloped properties, it is a flat $25 per year. For instance, the owner of a 1,000-square-foot house would pay $175 per year. The funds are designated to attract and keep qualified teachers, protect and fund programs like STEM instruction, arts and music, and reading/literacy, maintain small class sizes, and update classroom technology.
To ensure the money is spent properly, the measure states that “no funds will be used for administrative salaries or pensions.” Accountability includes creating a special spending account, filing an annual report, requiring an independent citizens' oversight committee to review spending and conducting annual independent financial audits.
Homeowners who live on the property and meet certain criteria can be exempt. This includes residents 65 or older, or those receiving Supplemental Security Income for a disability, or those receiving Social Security Disability Insurance benefits while meeting a specific low-income guideline.
A "Yes" vote supports enacting this new tax. A "No" vote is against levying the tax.
City council elections will be held in November for San Mateo, Redwood City and Pacifica.
Find more information at the San Mateo County Elections Department.
California's 2026 gubernatorial contest has become one of the most unpredictable races in political history, and with just one month left before the primary election, the slate of leading contenders to succeed outgoing Gov. Gavin Newsom continues to evolve.
Swalwell's departure and political collapse had a tremendous impact on the gubernatorial race, according to experts. Before the sexual assault allegations surfaced, Swalwell, who represented the Bay Area, received the support of 17 percent of likely voters, polls showed.
Swalwell's April 11 gubernatorial exit triggered an immediate shift, allowing former state Attorney General Xavier Becerra to advance in a new poll, gaining 10 percent of likely voters, while fellow Democrat and billionaire Tom Steyer was the frontrunner among Democrats with 14 percent of likely voters. Former Fox News commentator Steve Hilton, who received President Donald Trump's endorsement earlier this month, received 17 percent of support and was leading his Republican rival, Riverside County Sheriff Chad Bianco, who polled at 14 percent.
Former Rep. Katie Porter was in a dead heat with Becerra at 10 percent, while San Jose Mayor Matt Mahan received 5 percent of likely voters' support.
The poll, released on Thursday, was commissioned by the right-leaning Nexstar Media Group and Inside California Politics and conducted by Emerson College from April 14 through April 15.
Last month, California Democratic National Committee Chair Rusty Hicks released an open letter and made an unexpected plea for the Democratic field of contenders to "assess the viability of their candidacy and campaign," but stopped short of calling out any candidates or pressuring anyone to drop their bid.
With the primary election only a few weeks away — and the top Democratic contenders currently splitting the vote — 27 percent of likely voters remain undecided, which could affect the candidates who have moved up in the polls.
"The Emerson poll shows Becerra going from 7th or 8th place to tied for 4th or 5th place right now. Swalwell's exit, at least based on this poll, seems to have benefitted Steyer, Porter, Becerra, and Mahan — all Democrats who have improved over the last Emerson poll," Christian Grose, a political expert and director of the USC Democracy and Fair Elections Lab, told Patch.
"However, I think Steyer or Porter are best poised to benefit from Swalwell's exit as they have consistently polled the best among Democrats over multiple polls. The Emerson poll's results for other candidates will need to be replicated elsewhere before I believe there is movement for Becerra or Mahan. The race is fluid so seeing multiple polls with increases in these candidate numbers could help," Grose added.
A CBS News/YouGov poll released on Tuesday indicates the 2026 California governor's race continues to shift, but no contender — Democrat or Republican — has emerged as the frontrunner since Stalwell's campaign imploded. The poll was conducted between April 23 and April 27 following last week’s contentious gubernatorial debate.
According to the poll, Hilton has the strongest support among voters, with 16 percent. Steyer trailed with 15 percent of support.
Becerra continued to climb, with 13 percent. Bianco was polling at 10 percent, and Porter showed a marginal slip with 9 percent of support. Mahan also slid by about 1 percentage point, tying with former Los Angeles Mayor Antonio Villaraigosa, with 4 percent. State Superintendent Tony Thurmond received 1 percent of support.
In the ongoing gerrymander battle, California has been the biggest prize for House Democrats, who think they can pick up between three and five seats from state Republicans.
Here’s a brief breakdown of candidates in each of the state’s most competitive congressional districts:
District 1, the longtime Chico seat held by the late LaMalfa, is widely expected to swing Democratic after Prop. 50 shifted the district westward and southward to include coastal Northern California and parts of Sonoma County. According to the Cook Partisan Voter Index, the district went from being 12 percent more Republican than the national average to 7 percent more Democratic than the national average.
Voters in the changing district will have a confusing election day. That’s because on June 2, they’ll be voting in a special election in the current right-leaning District 1 for someone to finish out LaMalfa’s term, which expires Jan. 3. At the same time, voters in the new left-leaning District 1 will vote in the primary with the top two vote-getters heading to the Nov. 3 general election.
Candidates in the primary election include Democrats Audrey Denney, Janice Karrman, State Senator Mike McGuire of Healdsburg, and Republican State Assemblyman James Gallagher. No Party Preference candidates include Timothy Sean Kelly and Richard T. Minner.
District 6 in the suburbs of Sacramento is one in which incumbents are playing musical chairs thanks to Prop. 50. Democratic incumbent Rep. Ami Bera is now running in the new District 3, and District 3 Republican incumbent Rep. Kevin Kiley is running in District 6 as an Independent who will caucus with the Republicans. The party change would seem to give him a fighting chance in a new District 6 that leans Democratic.
“While this will be a more challenging race, I believe we can build a winning coalition for common sense,” Kiley wrote on social media.
Closely aligned with Trump, Kiley is running against a large field of Democratic contenders, including Lauren Babb Tomlinson, Martha Guerrero, Thien Ho, Richard Pan, and Tyler Vandenberg. Republican Michael Stansfield is also on the ballot.
District 22 was always going to be a challenge for incumbent Republican Rep. David Valadao, who won his Central Valley seat in a Democratic-leaning district in 2024. After Prop. 50, it’s even more Democratic leaning, with additional communities in Fresno and Madera counties.
The change in the district’s voter registration comes on top of Valadao’s party-line vote last year for Trump’s megabill that slashed taxes for wealthy Americans and cut $1 trillion in Medicaid funding over the next 10 years.
According to CalMatters, “Valadao’s district has the highest Medicaid enrollment rate of any Republican seat in the country.”
His Democratic opponents, Assemblywoman Jasmeet Bains and Randy Villegas, have hammered him on the issue.
District 40 is Southern California’s ruthlessly gerrymandered new district that pits Rep. Ken Calvert of Riverside County against Rep. Young Kim of Orange County, both Republicans.
According to Ballotpedia, the district is 10 percent more Republican than it used to be, with Calvert currently representing 51 percent of the new district and Kim 35 percent. Calvert is a Trump ally who has been in office for more than 30 years. Kim was elected to Congress in 2020, when she won in a more competitive district in purple Orange County.
In all, eight candidates are running in the district, including Democrats Francis Xavier Hoffman, Claude M. Keissieh, Joe Kerr, Esther Kim-Varet, Lisa Ramirez, and No Party Preference candidate Nina Linh.
District 48 doesn’t have an incumbent candidate after longtime Republican Rep. Darrell Issa decided to retire after his current term ends, rather than run for reelection in a district that now leans Democratic.
The new district covers parts of San Diego and Riverside counties, including Ramona, Escondido, Santee, Poway, Temecula, and Palm Springs.
In his announcement, Issa endorsed 48th Congressional District candidate Jim Desmond, a Republican who currently sits on the San Diego County Board of Supervisors.
"Jim is not only a personal friend, he’s a true patriot, a Navy veteran, a successful businessman, and has a 20-year record of public service," Issa said. "He understands this community, was born and raised here, and will make a terrific Congressman."
Desmond will have a fight on his hands in a district that went for Kamala Harris over President Donald Trump. He'll face 11 contenders, including Democrats Ammar Campa-Najjar, a Navy Reservist, and San Diego City Councilmember Marni von Wilpert, as well as Abel Chavez, Stephen Clemons, Corinna Contreras, Ferguson Porter, Brandon Riker, Mike Schaefer, and Eric Shaw. Republican Kevin Patrick O'Neil and No Party Preference candidate Luis F. Reyna are also in the race.
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