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D Democratic · U.S. House 5, California · Nov 3, 2026

Michael
Masuda

Democratic challenger Michael Masuda is running against Republican incumbent Tom McClintock for California's 5th Congressional District in 2026.

Background

Michael Masuda is a Democratic challenger running for California's 5th Congressional District in the November 2026 general election, opposing Republican incumbent Tom McClintock. He grew up in Amador County and holds a BS/MS in Electrical Engineering from California Polytechnic State University, San Luis Obispo. [2, 9]

Before entering politics, Masuda worked as an engineer at Johns Hopkins University's Applied Physics Laboratory from April 2015 to October 2021. He subsequently joined the U.S. Department of State as a Foreign Affairs Officer after receiving an American Association for the Advancement of Science Science & Technology Policy Fellowship, serving in that role from October 2023 to May 2025. [1, 2]

Masuda's campaign centers on democracy and representation in CA-5. His campaign website and FEC record both identify him as a challenger with no prior elected office. [3, 9]

His candidacy is registered with the FEC for the 2026 election cycle under the Democratic Party. 9

At a glance

Party
Democratic
Running for
U.S. House · District 5, California
Election
Nov 3, 2026
Website
votemasuda.com(opens in a new tab)

Where they stand

Each position links to the page it was drawn from. Quotes are verbatim.

Timeline

  1. Oct 10
    debate
    Masuda participates in Farm Bureau candidates forum in Madera

    The Madera Tribune reported Masuda participated in a Farm Bureau candidates forum. On water for San Joaquin Valley agriculture, he emphasized long-term planning, infrastructure maintenance, improving delivery, and research amid changing climate conditions.

    Candidates Forum held at Farm Bureau · Oct 10, 2026 (opens in a new tab)
  2. Sep 27
    endorsement
    Masuda endorsed by California Democratic Party, CTA, and North Valley Labor Federation

    The San Luis Obispo Tribune reported that Masuda had received endorsements from the California Democratic Party, California Teachers Association, and North Valley Labor Federation.

    Your guide to California's 5th Congressional District general race · Sep 27, 2026 (opens in a new tab)
  3. Sep 27
    news
    Masuda's FEC finances through June 30 reported: $361K raised, $89K cash on hand

    Masuda's campaign reported $361,735.22 in receipts, $272,283.71 in disbursements, and $89,451.51 cash on hand through June 30, 2026, per FEC filings.

    Your guide to California's 5th Congressional District general race · Sep 27, 2026 (opens in a new tab)
  4. Sep 24
    debate
    Masuda agrees to October debates moderated by Modesto and Merced Focus outlets

    The Modesto Focus reported that Masuda and Republican Kevin Lincoln agreed to October debates moderated by The Modesto Focus and The Merced Focus. McClintock had not responded to the invitation at time of reporting.

    Politics Focus | Save the date for VotingMatters – and free tacos · Sep 24, 2026 (opens in a new tab)
  5. Sep 15
    news
    Masuda holds Waterford town hall, calls for ending war in Iran

    At a Waterford town hall, Masuda criticized U.S. operations in Iran and called for ending the war, linking it to fuel and fertilizer costs for farmers. He stated: 'We need to end the war in Iran and we need to start bringing diesel prices down.'

    Fact Check: Where are Rep. McClintock, challenger Masuda on the war in Iran? · Sep 18, 2026 (opens in a new tab)
  6. Sep 11
    news
    Masuda holds open-format town hall in Oakdale

    Masuda held an open-format event in Oakdale focused on local economic concerns, including potential effects of AI data-center projects on electricity rates and water supply. McClintock was invited but did not attend.

    Congressional hopeful meets with local residents - Oakdale Leader · Sep 16, 2026 (opens in a new tab)
  7. Aug 27
    filing
    California certifies Masuda as Democratic candidate for November 3 general election

    California's certified general-election candidate list designates Masuda, with the ballot designation 'Foreign Affairs Officer,' as the Democratic candidate opposing Republican incumbent Tom McClintock in CA-05.

    Tom McClintock | Biography & Record — The Conservative Ledger · Sep 17, 2026 (opens in a new tab)
  8. Jun 2
    filing
    Masuda advances to general election after June primary

    In the top-two primary, McClintock received 129,653 votes (61.3%) and Masuda 51,418 (24.3%). Both advanced to the November general election in CA-05.

    Tom McClintock | Biography & Record — The Conservative Ledger · Sep 17, 2026 (opens in a new tab)

Endorsements

  • Indivisible Amador organization
    Listed as endorser on Masuda's campaign page; no date given. votemasuda.com
  • CA5Unite organization
    Listed as endorser on Masuda's campaign page; no date given. votemasuda.com
  • Progressive Mariposa / Yosemite Area Indivisible organization
    Listed as endorser on Masuda's campaign page; no date given. votemasuda.com
  • California Young Democrats organization
    Listed among 2026 primary and general election endorsements; no individual endorsement date given. cayoungdems.net
  • California Teachers Association union
    Reported by the Fresno Bee in its September 27, 2026 guide to the district race; date of endorsement not specified. fresnobee.com
  • California High School Democrats organization
    Campaign page quotes the organization announcing its support for the 2026 midterm elections; no date given. votemasuda.com
  • North Valley Labor Federation union
    Named as an endorser in the Progressive Voters Guide (updated October 6, 2026); no endorsement date given. progressivevotersguide.com
  • Fresno State College Democrats organization
    Listed as endorser on Masuda's campaign page; no date given. votemasuda.com
  • National Association of Letter Carriers, Local 1291 union
    Listed on the campaign endorsement page; no date given. votemasuda.com
  • Turlock Democratic Club organization
    Listed as endorser on Masuda's campaign page; no date given. votemasuda.com
  • Progressive Democrats of America organization
    Noted in an October 11, 2026 Common Dreams article as an endorser; date of endorsement not specified. commondreams.org
  • Modesto Progressive Democrats organization
    Listed as endorser on Masuda's campaign page; no date given. votemasuda.com
  • Equality California organization
    Announced endorsement of Masuda for CA-5 on August 27, 2026. eqca.org · Aug 27, 2026
  • California Federation of Labor Unions, AFL-CIO union
    Listed in the federation's pre-general-election COPE endorsement recommendations dated August 4, 2026. calaborfed.org · Aug 4, 2026
  • California Democratic Party official
    Named on the party's general-election endorsement list dated August 2, 2026. KCRA also reported the endorsement was made at the 2026 State Convention. cadem.org · Aug 2, 2026

Campaign finance

Totals filed with the Federal Election Commission for the 2026 election cycle.

Raised
$362K
Spent
$272K
Cash on hand
$89K

As of Jun 30, 2026. Filings are periodic, so recent money may not be included yet. ↳ FEC record H6CA05377(opens in a new tab)

Sources 19

  1. [1] Meet the 9 Former Federal Workers Running for Congress | Common Dreams(opens in a new tab) Oct 11, 2026
  2. [2] Candidates Forum held at Farm Bureau(opens in a new tab) Oct 10, 2026
  3. [3] Endorsements - California Young Democrats(opens in a new tab) Oct 3, 2026
  4. [4] Issues | Policy Positions — Michael Masuda for Congress in CA5(opens in a new tab) Sep 27, 2026
  5. [5] Your guide to California's 5th Congressional District general race(opens in a new tab) Sep 27, 2026
  6. [6] Your guide to California's 5th Congressional District general race(opens in a new tab) Sep 27, 2026
  7. [7] Politics Focus | Save the date for VotingMatters – and free tacos(opens in a new tab) Sep 24, 2026
  8. [8] Fact Check: Where are Rep. McClintock, challenger Masuda on the war in Iran?(opens in a new tab) Sep 18, 2026
  9. [9] Congressional candidate Masuda prioritizes small Central Valley towns in his campaign(opens in a new tab) Sep 17, 2026
  10. [10] Tom McClintock | Biography & Record — The Conservative Ledger(opens in a new tab) Sep 17, 2026
  11. [11] Congressional hopeful meets with local residents - Oakdale Leader(opens in a new tab) Sep 16, 2026
  12. [12] Amador County - Progressive Voters Guide(opens in a new tab) Aug 31, 2026
  13. [13] August 27, 2026 at 1:56 pm(opens in a new tab) Aug 27, 2026
  14. [14] Endorsements(opens in a new tab) Aug 16, 2026
  15. [15] [PDF] 2026 General Election Endorsements(opens in a new tab) Aug 8, 2026
  16. [16] California Federation of Labor Unions(opens in a new tab) Aug 5, 2026
  17. [17] California Primary: 5th Congressional District candidates on the issues(opens in a new tab) May 20, 2026
  18. [18] Facing uphill climb against entrenched incumbent, Michael Masuda makes his case for the US House(opens in a new tab) May 9, 2026
  19. [19] Masuda Statement on Gaza — Michael Masuda for Congress(opens in a new tab) Jan 29, 2026
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