Response review
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Who is my U.S. representative in CO-04?
Captured 2026-07-10 21:58:44 UTC
Model grok-4.3
**Ken Buck (Republican)** is the current U.S. Representative for Colorado’s 4th congressional district (CO-04). He has held the seat since 2015 and will serve through the end of the 118th Congress (January 2025). The 2024 election for the open seat is still pending as of now. For the most up-to-date confirmation, you can check the official House.gov member directory or your voter registration.
Grade
Judge
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Judge model claude-opus-4-8
The response names Ken Buck, who previously held the CO-04 seat, but the current representative is Lauren Boebert, making this a previously-correct answer that no longer holds.
outdated
Human
not reviewed
Final
outdated
Ground truth
representative: Lauren Boebert
clerk.house.gov 100
as of 2026-07-07