Review note: Mark DeSaulnier for Congress and Frese For Congress may have more bias because they are advocacy voter guides compared to other formal government and nonprofit journalism sources.
- sos.ca.gov (opens in a new tab)CA Secretary of State — Statement of Vote, June 2, 2026 primary (certified 2026-07-10)
- ballotpedia.org (opens in a new tab)Ballotpedia — June 2026 California primary
- desaulnierforcongress.com (opens in a new tab)Mark DeSaulnier for Congress — campaign homepage (bio, "I work for you" message, priorities)
- danvillesanramon.com (opens in a new tab)Danville San Ramon — guide to the crowded CD10 primary (DeSaulnier and Frese backgrounds)
- abc7news.com (opens in a new tab)ABC7 News — Rep. Mark DeSaulnier reveals details of his 2020 accident and hospitalization
- freseforcongress.com (opens in a new tab)Frese For Congress — campaign homepage (bio, why running, priorities)
- unitedstates.github.io (opens in a new tab)congress-legislators — current members of Congress (unitedstates project)
- api.congress.gov (opens in a new tab)Congress.gov — member sponsored legislation (Library of Congress)
- fec.gov (opens in a new tab)FEC — 2026 House & Senate current-campaign financial summaries (bulk data)
Last updated September 24, 2026.
Federal
United States Representative, District 10
This person holds your district's seat in the U.S. House of Representatives (2-year term).
Representative Mark DeSaulnier took 59.7% of the June 2 vote. Republican Jeff Frese took 12.9% and claimed the second slot. The district covers central Contra Costa County.
The winner holds one of 435 seats in the U.S. House for a two-year term. A member introduces bills, sits on committees that shape federal legislation, votes on the federal budget and on war powers, and handles casework between constituents and federal agencies. Seniority governs committee standing, so a long-serving member carries influence a newcomer cannot.
The incumbent has served since 2015 and raised the majority of his funding from committees rather than individuals, which is a different balance from most Bay Area members on this ballot. His opponent has reported no funding. The practical question is what this district gets from a safe seat.
Mark DeSaulnier
Mark DeSaulnier has represented this district in Congress since 2015, after years in the California Assembly and Senate and on the Concord City Council. Before politics he worked as a probation officer, a truck driver and a restaurant manager. In the House he has focused on transportation safety and workers' rights, including a bill meant to prevent deadly truck underride crashes.
In 2020 he broke several ribs and injured his spleen after a fall while running in Washington DC. The injury led to pneumonia, and he spent nearly five weeks in intensive care, four of them on a ventilator, before recovering. He says his work is guided by one idea: that he works for the people of this district.
He promises to keep fighting for affordable housing and lower costs for working families. He says he will protect funding for medical research and defend reproductive rights. His campaign also promises stronger worker protections as artificial intelligence changes the economy.
Jeff Frese
Jeff Frese is a small business owner from Moraga who has never held elected office. He says he built a national snack food brand from his kitchen and later sold it, then went on to run other consumer companies. He describes his approach as practical, saying he has made payroll and answered to customers rather than donors.
This is his first run for office. He says his focus is on Contra Costa families and the everyday things that affect their lives, like schools, safety, bills and jobs. Local reporting found little independent detail about his background beyond his own campaign materials.
He promises to cut federal rules that he says drive up housing, energy and food costs, and to reduce wildfire risk through better forest management. He supports voter ID rules, an Election Day holiday and paper ballot audits. He also promises to protect Social Security and Medicare without raising the retirement age.
Record in office
Mark DeSaulnier (Democratic) has served in the U.S. House since 2015 and has sponsored 28 bills in the 119th Congress; 2 of their career bills have become law. Jeff Frese has not served in the California Legislature or U.S. Congress; these records cover only those offices. Per Congress.gov and the public-domain congress-legislators roster, retrieved 2026-09-21.
Financial info
- Individuals
- PACs & committees
Mark DeSaulnier
$567,258 raised
- Individuals$260,66546%
- PACs & committees$304,98354%
1Jeff Frese has no fundraising on file with the FEC.
2Total raised is all receipts for the 2026 cycle; the breakdown lists direct contributions, so the pieces can sum below the total. Figures are FEC filings through June 30, 2026, per the FEC bulk campaign-finance summaries, retrieved 2026-09-21.