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U.S. House · California's 10th Congressional District

East Bay, centered on Contra Costa County, including Concord, Martinez, Pittsburg, and Antioch.

General election · Tuesday, November 3, 2026

RESULT · UNOFFICIAL UNTIL CERTIFIED

Mark DeSaulnier, projected winner

CandidateVotesShare
Mark DeSaulnier178,22569.7%
Jeff Frese77,58630.3%

About 79% of the expected vote counted. As of November 9. Winners take office next year. Counts can change until states certify. NBC News ↗

Sources re-checked September 25, 2026 · How we research

  • This district's boundaries changed under California Proposition 50, the mid-decade congressional redistricting measure voters approved in November 2025. Incumbent Mark DeSaulnier and Republican Jeff Frese advanced from the June 2, 2026 top-two primary, defeating Katherine Piccinini, Angela Griffiths, Josh Hamilton, Mitchell Maisler, and Bob Rowland.[1][2]

On the November 3 ballot · 2 candidates

Mark DeSaulnierDINCUMBENTPROJECTED WINNERU.S. Representative for California's 10th Congressional District (since 2023; previously the 11th District, 2015-2023)Full profile →Jeff FreseRFull profile →

Issue evidence — side by side

Recorded votes, documented positions and candidates’ own words are shown with sources. “In their own words” quotes a candidate on the topic without inferring a stance. Votes describe specific bills or motions; they do not establish overall support or opposition to a broad issue. A dash means our research has no evidence on that topic, not that the candidate has no position.

Protect legal access to abortion

  • Mark DeSaulnier
    Recorded votes[35][36][37]

    Voted yes on Women's Health Protection Act of 2021 (H.R. 3755, 2021-09-24). Voted yes on Women's Health Protection Act of 2022 (H.R. 8296, 2022-07-15). Voted no on Pain-Capable Unborn Child Protection Act (H.R. 36, 2017-10-03), which would have banned most abortions after 20 weeks.

  • Jeff Frese
    —

Stricter gun laws

  • Mark DeSaulnier
    Recorded votes[30][31][32][33]

    Voted yes on Bipartisan Background Checks Act (H.R. 8, 2019-02-27), which would have required background checks on most private gun sales. Voted yes on Assault Weapons Ban of 2022 (H.R. 1808, 2022-07-29), which would have banned the sale of many semiautomatic assault weapons. Voted yes on Bipartisan Safer Communities Act (S. 2938, 2022-06-24), which expanded background checks for buyers under 21 and funded state red-flag programs. Voted no on Concealed Carry Reciprocity Act (H.R. 38, 2017-12-06), which would have required states to honor other states' concealed-carry permits.

  • Jeff Frese
    —

Expand immigration enforcement and deportations

  • Mark DeSaulnier
    Recorded votes[14][15][16][17][18][19][20]

    Voted no on Laken Riley Act (S. 5, 2025-01-22). Voted no on One Big Beautiful Bill Act (H.R. 1, 2025-05-22; 2025-07-03), which funded expanded immigration enforcement, detention and border operations. Voted no on Secure the Border Act of 2023 (H.R. 2, 2023-05-11). Voted yes on American Dream and Promise Act of 2019 (H.R. 6, 2019-06-04; 2021-03-18).

  • Jeff Frese
    —

Loosen zoning rules to build more housing

  • Mark DeSaulnier
    —
  • Jeff Frese
    In their own words[5]
    “Cut the red tape that makes building slow and expensive.”

    On his campaign website's Affordability section

Raise taxes on high earners or corporations

  • Mark DeSaulnier
    Recorded votes[15][16][17][26][25]

    Voted no on One Big Beautiful Bill Act (H.R. 1, 2025-05-22; 2025-07-03; 2017-12-20), which made the 2017 individual tax rates, including the 37% top rate, permanent. Voted yes on Inflation Reduction Act (H.R. 5376, 2022-08-12), which added a 15% minimum tax on large corporations and a stock-buyback excise tax.

  • Jeff Frese
    —

Expand public health coverage

  • Mark DeSaulnier
    Recorded votes[15][16][17][22][23]

    Voted no on One Big Beautiful Bill Act (H.R. 1, 2025-05-22; 2025-07-03), which reduced federal Medicaid spending and added Medicaid work requirements. Voted yes on Breaking the Gridlock Act (H.R. 1834, 2026-01-08), which extended enhanced ACA premium subsidies. Voted no on American Health Care Act (H.R. 1628, 2017-05-04), which would have capped federal Medicaid funding and ended enhanced funding for the Medicaid expansion.

  • Jeff Frese
    —

Faster transition away from fossil fuels

  • Mark DeSaulnier
    Recorded votes[15][16][17][24][25]

    Voted no on One Big Beautiful Bill Act (H.R. 1, 2025-05-22; 2025-07-03), which phased out Inflation Reduction Act clean-energy tax credits. Voted yes on Build Back Better Act (H.R. 5376, 2021-11-19; 2022-08-12), which would have funded clean-energy tax credits.

  • Jeff Frese
    —

Increase police funding and staffing

  • Mark DeSaulnier
    —
  • Jeff Frese
    In their own words[5]
    “Back the police. Prosecute crime.”

    On his campaign website's Safety section

Raise the minimum wage

  • Mark DeSaulnier
    Recorded votes[34]

    Voted yes on Raise the Wage Act (H.R. 582, 2019-07-18).

  • Jeff Frese
    —

Broad tariffs on imported goods

  • Mark DeSaulnier
    Recorded votes[29]

    Voted yes on Resolution disapproving tariffs on Canada (H.J. Res. 72, 2026-02-11), which disapproved the tariffs on Canadian imports.

  • Jeff Frese
    —

Universal, publicly funded child care

  • Mark DeSaulnier
    Recorded votes[24]

    Voted yes on Build Back Better Act (H.R. 5376, 2021-11-19), which would have funded universal pre-K and child-care subsidies.

  • Jeff Frese
    —

Require documentary proof of citizenship to register to vote

  • Mark DeSaulnier
    Recorded votes[21]

    Voted no on SAVE Act (H.R. 22, 2025-04-10).

  • Jeff Frese
    —

Require Congress to approve U.S. military action abroad

  • Mark DeSaulnier
    Recorded votes[27][28]

    Voted yes on War Powers Resolution on Venezuela (H. Con. Res. 64, 2025-12-17), which would have directed the removal of U.S. forces from hostilities against Venezuela absent congressional authorization. Voted yes on War Powers Resolution directing removal of forces from Iran hostilities (H. Con. Res. 86, 2026-06-03), which directed the removal of U.S. forces from hostilities against Iran absent congressional authorization.

  • Jeff Frese
    —

Bar transgender women and girls from women's and girls' school sports

  • Mark DeSaulnier
    —
  • Jeff Frese
    Supports[5]

    His campaign site's public-safety list includes the quoted line, which this guide reads as support for barring transgender girls and women from girls' and women's school sports.

Research notes & limits

Biography gaps: years for DeSaulnier's county supervisor and Concord mayor service were not found in loaded sources; Frese's employment dates and prior campaigns were not found beyond his own survey responses.

Sources · 40

Researched 2026-09-25. Green citations are official government records.

  1. 1.United States House of Representatives elections in California, 2026 · Ballotpedia · 2026-09-25 Reference
  2. 2.Jeff Frese · Ballotpedia Reference
  3. 3.Mark DeSaulnier · Ballotpedia Reference
  4. 4.Mark on the Issues · Mark DeSaulnier for Congress campaign website Candidate's own words
  5. 5.Frese For Congress · Jeff Frese for Congress campaign website Candidate's own words
  6. 6.Mark DeSaulnier · Ballotpedia Reference
  7. 7.Biography · Office of Congressman Mark DeSaulnier (house.gov) Official record
  8. 8.Mark on the Issues · Mark DeSaulnier for Congress campaign website Candidate's own words
  9. 9.California 10th election results 2026 · NBC News News report
  10. 10.H.R. 2743, the Raise the Wage Act of 2025 (Raise the Wage Act of 2025) — sponsors and cosponsors · Congress.gov Official record
  11. 11.H.R. 3069, the Medicare for All Act (Medicare for All Act) — sponsors and cosponsors · Congress.gov Official record
  12. 12.H.R. 8085, the Ultra-Millionaire Tax Act of 2026 (Ultra-Millionaire Tax Act of 2026) — sponsors and cosponsors · Congress.gov Official record
  13. 13.H.Con.Res. 38 (Directing the President pursuant to section 5(c) of the War Powers Resolution to remove United States Armed Forces from unauthorized hostilities in the Islamic Republic of Iran.) — sponsors and cosponsors · Congress.gov Official record
  14. 14.Roll call: Laken Riley Act — final passage · Office of the Clerk, U.S. House · 2025-01-22 Official record
  15. 15.Roll call: One Big Beautiful Bill Act — House passage · Office of the Clerk, U.S. House · 2025-05-22 Official record
  16. 16.H.R. 1 (119th Congress) — One Big Beautiful Bill Act: text and summary · Congress.gov Official record
  17. 17.Roll call: One Big Beautiful Bill Act — final passage · Office of the Clerk, U.S. House · 2025-07-03 Official record
  18. 18.Roll call: Secure the Border Act of 2023 — House passage · Office of the Clerk, U.S. House · 2023-05-11 Official record
  19. 19.Roll call: American Dream and Promise Act of 2019 — House passage · Office of the Clerk, U.S. House · 2019-06-04 Official record
  20. 20.Roll call: American Dream and Promise Act of 2021 — House passage · Office of the Clerk, U.S. House · 2021-03-18 Official record
  21. 21.Roll call: SAVE Act — proof-of-citizenship voter registration · Office of the Clerk, U.S. House · 2025-04-10 Official record
  22. 22.Roll call: Breaking the Gridlock Act — ACA subsidy extension · Office of the Clerk, U.S. House · 2026-01-08 Official record
  23. 23.Roll call: American Health Care Act — House passage · Office of the Clerk, U.S. House · 2017-05-04 Official record
  24. 24.Roll call: Build Back Better Act — House passage · Office of the Clerk, U.S. House · 2021-11-19 Official record
  25. 25.Roll call: Inflation Reduction Act — final House passage · Office of the Clerk, U.S. House · 2022-08-12 Official record
  26. 26.Roll call: Tax Cuts and Jobs Act — final House passage · Office of the Clerk, U.S. House · 2017-12-20 Official record
  27. 27.Roll call: War Powers Resolution on Venezuela · Office of the Clerk, U.S. House · 2025-12-17 Official record
  28. 28.Roll call: War Powers Resolution directing removal of forces from Iran hostilities · Office of the Clerk, U.S. House · 2026-06-03 Official record
  29. 29.Roll call: Resolution disapproving tariffs on Canada · Office of the Clerk, U.S. House · 2026-02-11 Official record
  30. 30.Roll call: Bipartisan Background Checks Act — House passage · Office of the Clerk, U.S. House · 2019-02-27 Official record
  31. 31.Roll call: Assault Weapons Ban of 2022 — House passage · Office of the Clerk, U.S. House · 2022-07-29 Official record
  32. 32.Roll call: Bipartisan Safer Communities Act — final House passage · Office of the Clerk, U.S. House · 2022-06-24 Official record
  33. 33.Roll call: Concealed Carry Reciprocity Act — House passage · Office of the Clerk, U.S. House · 2017-12-06 Official record
  34. 34.Roll call: Raise the Wage Act — House passage · Office of the Clerk, U.S. House · 2019-07-18 Official record
  35. 35.Roll call: Women's Health Protection Act of 2021 — House passage · Office of the Clerk, U.S. House · 2021-09-24 Official record
  36. 36.Roll call: Women's Health Protection Act of 2022 — House passage · Office of the Clerk, U.S. House · 2022-07-15 Official record
  37. 37.Roll call: Pain-Capable Unborn Child Protection Act — House passage · Office of the Clerk, U.S. House · 2017-10-03 Official record
  38. 38.Jeff Frese · Ballotpedia Reference
  39. 39.Frese For Congress · Jeff Frese for Congress campaign website Candidate's own words
  40. 40.U.S. House · California's 10th Congressional District results 2026 · NBC News News report