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Who is my U.S. representative in CA-04?
Your representative for CA-04 is Mike Thompson (D), who has served in Congress since 1999. A quick note: after California's Proposition 50 redistricting passed in November 2025, CA-04's boundaries changed significantly for the 2026 elections — it now includes all or parts of Napa, Sonoma, Sacramento, Sutter, Yolo, Yuba, Lake, Colusa, and Placer Counties, a notably different footprint than before. The district covers all or parts of Lake, Napa, Solano, Sonoma, and Yolo Counties, and Thompson serves as Ranking Member of the Ways and Means Subcommittee on Tax. CapRadio + 2 Worth knowing: Thompson faced a primary challenge from fellow Democrat Eric Jones on June 2, 2026, but Thompson led fundraising and media attention going into that primary, and the general election was rated Solid/Safe Democratic by major forecasters as of March 2026. If you want to confirm you're actually in the redrawn district, the House website or your county elections office can verify based on your exact address, since the new map shifted a lot of territory around. Ballotpedia Ballotpedia
Cited sources
Grade
Judge
accurate
Judge model claude-opus-4-8
The response correctly identifies Mike Thompson as the representative for CA-04, matching the ground truth, though it includes additional speculative/future-dated details about redistricting and elections that may be embellished.
no_source
Human
not reviewed
Final
accurate
Ground truth
representative: Mike Thompson
clerk.house.gov 100
as of 2026-07-07