Mark DeSaulnier
Democrat · CA-10 · U.S. House
Bio
Mark James DeSaulnier is an American politician who has served as a U.S. representative from California since 2015. He has represented the 10th congressional district since 2023, although it was previously numbered the 11th district for his first eight years in office. The district includes most of Contra Costa County, a suburban county in the East Bay. Until 2000, he was a member of the Republican Party; he has since been a member of the Democratic Party.
Full bio on Wikipedia →Record of service
- In office
- 11.6 years
- First took office
- 2015 (6 terms)
- Seniority
- 129 of 437 by time served
- Age
- 74
- Walnut Creek, CA · 925-933-2660
- Antioch, CA · 925-754-0716
Service history, offices and identifiers from unitedstates/congress-legislators (public domain). Years served sum each term rather than subtracting the first start date, so a break in service is not counted as time in office.
Reported net worth
- Assets
- $301k – $615k
- Liabilities
- $250k – $500k
- Net worth
- −$199k – $365k
- Since 2019
- +$442k
Largest holdings in the 2025 filing · 3 assets reported
Largest first, capped at 40 line items. Each is the asset's reported value bracket, not the income it produced.
From annual financial disclosures, which report every asset and debt as a bracket — so these are ranges, and the figure shown is their midpoint. A primary residence is not a reportable asset while its mortgage is a reportable debt, which pushes some members negative. How this is calculated →
Overall lean (DW-NOMINATE)
Issue profile
Each issue runs left ↔ right, scored from how the member voted on bills tagged to that issue (−1…+1). Issues with too few votes are blank. Overall lean uses DW-NOMINATE.
How they score against the parties
Mark DeSaulnier's voting record compared with each party's national platform, issue by issue — the same similarity score used across the site.
On the political map
Mark DeSaulnier (the large ringed dot) among every current member of Congress and the party platforms.
Each small dot is a current member (Dem · Rep); the larger dots are party platforms — click one for its closest members. Economic axis: taxes, healthcare, labor, energy. Social axis: abortion, guns, immigration, civil rights, crime.
Do you vote like DeSaulnier?
Answer a few questions on the issues and see which members of Congress — and which party — actually line up with you.
Caucuses & committees
Where DeSaulniersits in Congress's own organization — each group's lean is computed from its members' voting records. Explore them all on the caucuses and committees pages.
Caucuses
- Congressional Progressive Caucusstrongly left · 93 members
- Congressional Asian Pacific American Caucusstrongly left · 77 members
- Congressional Equality Caucusstrongly left · 153 members
Committees
- House Committee on Education and Workforcecenter · 36 members
- House Committee on Transportation and Infrastructurecenter · 66 members
Most and least aligned members
Treating DeSaulnier's 14 issue scores as a vector, cosine similarity measures whether two voting records point the same way (+100%) or in opposite directions (−100%) — the colleagues whose records align most and least with theirs.
Recent notable votes
Latest news
A Whiff of Rebellion From Trump’s Labor BoardEven Crystal S. Carey, Republican general counsel of the National Labor Relations Board, or NLRB, the federal agency that adjudicates labor-management disputes, thinks President Donald Trump and congressional Republicans are screwing up her agency.Carey, who …
The New Republic · June 5, 2026
How Trump Is Wrecking the Agency That Protects Worker’s Labor RightsA great riddle of the 2024 election is how Donald Trump managed to double (to 14 points) his advantage among working class voters, defined as those lacking a college degree, compared to 2016. This is a mystery because Trump spent much of his first term underm…
The New Republic · June 1, 2026
RFK Jr. Uses Vape Brand’s Marketing to Promote VapingHealth Secretary Robert F. Kennedy Jr. tried to claim Friday that vaping is healthier than smoking.Speaking before the House Education and Workforce Committee, Kennedy tried to peddle some of his classic pseudoscience. “There’s an argument for vapes,” Kennedy…
The New Republic · April 17, 2026
California Democrats Ask Kristi Noem Not to Reopen FCI Dublin as an Immigration JailThe lawmakers, including East Bay Rep. Mark DeSaulnier, said they were concerned about detention center conditions and deaths in ICE custody.
KQED · February 18, 2026
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