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Mark DeSaulnier
U.S. Representative, California
2134 Rayburn House Office Building
Summary
Mark James DeSaulnier is an American politician who has served as a U.S. representative from California since 2015. He has represented California's 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. A member of the Democratic Party since 2000, he was previously a member of the Republican Party.
Source: Wikipedia · as of Aug 21, 2026
Scorecard
The record at a glanceA quick read on how Rep. DeSaulnier votes and legislates this Congress. Every figure links to its full record below.
Views on the Issues
See where Rep. DeSaulnier stands — alongside Democratic and Republican positions.
Sponsored Legislation
See all 226 →HR 10087
HR 10087 · Introduced Aug 13, 2026 · Health
Aug 13, 2026: Referred to the Committee on Energy and Commerce, and in addition to the Committee on Ways and Means, for a period to be subsequently determined by the Speaker, in each case for consideration of such provisions as fall within the jurisdiction of the committee concerned.
HR 10019
HR 10019 · Introduced Aug 3, 2026 · Transportation and Public Works
Aug 3, 2026: Referred to the House Committee on Transportation and Infrastructure.
HJRES 208
HJRES 208 · Introduced Aug 3, 2026 · Education
Aug 3, 2026: Referred to the House Committee on the Judiciary.
HR 9947
HR 9947 · Introduced Jul 27, 2026 · Labor and Employment
Jul 27, 2026: Referred to the House Committee on Education and Workforce.
Voting Analytics
Full record →Computed over Rep. DeSaulnier's 645 roll-call votes in the 119th Congress, of which 447were party-split (the two parties' majorities on opposite sides). Unanimous votes are excluded so the rates aren't inflated.
99.8%
Votes with the Democratic majority
On party-split votes
0.2%
Votes with the other party
The bipartisanship read
1.9%
Missed votes
Chamber median 2.2% · at or below median
Placement on the House's left–right spectrum
More liberalMore conservative
Based on how often Rep. DeSaulnier sided with the Republican majority on party-split votes, ranked against all representatives. This is a vote-agreement placement, not an academic ideology score.
Source: Clerk of the U.S. House (roll-call votes) · as of Sep 9, 2025
Legislative Activity
What Rep. DeSaulnier has put their name on in the 119th Congress, and across their career. Most bills — from every member — never become law; the enacted count is context, not a grade.
24
Sponsored this Congress
226 all-time
0
Became law this Congress
0% of those sponsored
3,733
Cosponsored, all-time
Signed on to others' bills
226
Bills sponsored, all-time
Source: Congress.gov · as of Aug 21, 2026
Landmark Legislation
Major bills from recent Congresses — outcomes and party vote breakdowns. For Rep. DeSaulnier's individual votes, view their full record on Congress.gov.
Inflation Reduction Act
Enacted2022 · H.R. 5376Largest climate investment in U.S. history; allowed Medicare to negotiate drug prices; reduced the federal deficit.
D: 50 yeaR: 0 yeaFinal: 51–50
CHIPS Act
Enacted2022 · H.R. 4346Invested $52 billion in domestic semiconductor manufacturing to reduce dependence on foreign chip supply chains.
D: 47 yeaR: 17 yeaFinal: 64–33