Response review
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Who is my U.S. representative in CA-10?
Your current U.S. representative for California's 10th District is Mark DeSaulnier (D-Concord). DeSaulnier is the incumbent, having represented the district for the past 12 years, with constituents including residents of San Ramon, Danville, Alamo, and other portions of Contra Costa and Alameda counties. Danville San Ramon A couple of things worth noting: California redrew its congressional maps ahead of 2026 under a new redistricting plan approved by voters in a November 2025 special election, so if you're near the edge of the district, it's worth double-checking you're still in CA-10 under the new boundaries. Ballotpedia DeSaulnier is running for re-election in the June 2, 2026 primary against several challengers, so this is his status as of now — the general election is in November 2026. Danville San Ramon If you want to confirm your exact district based on your address (in case the new maps shifted your boundary), you can check on the California Secretary of State's site or GovTrack.
Cited sources
Grade
Judge
partially accurate
Judge model claude-opus-4-8
The response correctly identifies Mark DeSaulnier as the representative, matching the ground truth, but includes fabricated geographic details—DeSaulnier represents CA-10 covering parts of Contra Costa County, but San Ramon, Danville, and Alamo are not accurately his district, suggesting some invented specifics.
no_source
Human
not reviewed
Final
partially accurate
Ground truth
representative: Mark DeSaulnier
clerk.house.gov 100
as of 2026-07-07