Santa Clara County primary races are drawing major campaign spending ahead of the Tuesday, June 2, 2026 primary election, with fundraising gaps emerging in the District 1 supervisor race and the county prosecutor contest.
Campaign finance filings show District 1 Supervisor Sylvia Arenas and District Attorney Jeff Rosen holding clear fundraising advantages over their challengers, according to reporting by San José Spotlight and public campaign finance records available through Santa Clara County’s NetFile disclosure portal.
Santa Clara County District 1 Fundraising Shows Arenas Ahead
Arenas has raised more than $119,000 between 2025 and 2026 and spent more than $3,600 as she seeks to retain the South County seat she won in 2022. Her challenger, Rebecca Munson, a Morgan Hill Unified School District board member, has raised $7,580 and spent $7,400 this year, filings show.
Arenas told San José Spotlight that District 1 families want her to “keep up your focus on solutions,” pointing to her campaign’s emphasis on county services, child welfare and South County issues.
Outside Spending Boosts South County Supervisor Race
Independent spending has also become a major factor. Outside groups have spent about $130,300 this year, largely to support Arenas through mailers, precinct walking, phone banking and online advertising.
The South Bay Labor Council’s independent committee has spent more than $125,700 supporting Arenas and $307 supporting Rosen. The California Taxpayer Protection Committee has spent more than $4,200 supporting Munson.
Munson declined to comment to San José Spotlight, but her campaign platform focuses on stronger representation for the agricultural district, balancing the county budget, protecting essential services, improving public hospital efficiency, and working with local officials on homelessness and mental health.
Jeff Rosen Holds Fundraising Edge in Santa Clara County DA Race
In the race for Santa Clara County district attorney, incumbent Jeff Rosen has raised roughly $437,000 between 2025 and 2026 and spent nearly $109,000. His challenger, Deputy District Attorney Daniel Chung, has raised $127,000, including about $100,000 in loans from himself, and spent $32,000.
Rosen told San José Spotlight that no candidate seeking reelection should “take voters for granted.” Chung described the fundraising gap as a “David and Goliath” race but said his campaign has been active in the community.
Sheriff Bob Jonsen, District 4 Supervisor Susan Ellenberg and County Assessor Neysa Fligor are running unopposed in their reelection bids.
The races matter because campaign money, outside spending and voter outreach could shape turnout in South County and influence the balance of local power in Santa Clara County government.
