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2026 U.S. Senate election in Colorado
Voters in Colorado will elect one member to the U.S. Senate on November 3, 2026, with the primary scheduled for June 30, 2026. The race is for the Class II seat held by incumbent Democrat John Hickenlooper, and the contest is drawing attention because Hickenlooper faces a Democratic primary challenge from state Sen. Julie Gonzales while Republicans are competing to become the general-election nominee.
Candidates
John Hickenlooper
John Hickenlooper is the incumbent Democratic U.S. senator from Colorado seeking reelection in 2026. In March 2026, he qualified for the Democratic primary ballot by petition and has continued to report strong fundraising and endorsements from groups including Planned Parenthood Action and an environmental organization.
Karen Breslin is listed by Ballotpedia as a candidate in the Democratic primary for Colorado's 2026 U.S. Senate race. Publicly available biographical information was limited in the sources reviewed, so her broader career history and education could not be confirmed from the materials found.
Julie Gonzales is a Democratic state senator from Denver who launched a primary challenge to incumbent U.S. Sen. John Hickenlooper in December 2025. In February 2026, a Working Families Party-backed poll showed her closing the gap with Hickenlooper after voters were given more information about the candidates.
Brashad Hasley is listed by Ballotpedia as a Democratic primary candidate in the Colorado Senate race. The sources reviewed did not provide enough reliable biographical detail to confirm his career history or education.
Jessica Williams is listed by Ballotpedia as a Democratic primary candidate in Colorado's 2026 U.S. Senate race. The available sources did not provide enough verified background information to summarize her career or education in detail.
Anthony Zimpfer is listed by Ballotpedia as a Democratic primary candidate in Colorado's 2026 U.S. Senate race. The sources reviewed did not yield enough reliable biographical detail to confirm his career history or education.
Mark Baisley is a Republican Colorado state senator who left the gubernatorial race in January 2026 and entered the U.S. Senate contest against incumbent Democrat John Hickenlooper. His campaign announcement shifted him into the Senate primary field as one of the Republican candidates seeking the nomination.
Amanda Calderon is listed by Ballotpedia as a Republican primary candidate in Colorado's 2026 U.S. Senate race. The sources reviewed did not provide enough verified background information to confirm her career history or education.
Dathan Jones is listed by Ballotpedia as a Republican primary candidate in Colorado's 2026 U.S. Senate race. The sources reviewed did not provide enough reliable biographical detail to confirm his career history or education.
Janak Joshi is a Republican candidate in Colorado's 2026 U.S. Senate race and has previously served in Colorado state politics. His campaign profile is associated with conservative policy positions and prior legislative experience.
George Washington Markert is listed by Ballotpedia as a Republican primary candidate in Colorado's 2026 U.S. Senate race. The sources reviewed did not provide enough verified biographical detail to confirm his career history or education.
Sean Pond is listed by Ballotpedia as a Republican primary candidate in Colorado's 2026 U.S. Senate race. The sources reviewed did not provide enough reliable biographical detail to confirm his career history or education.
Polling
Data Analysis Information
Data compiled from public sources and analyzed using AI. Last updated 4/6/2026. Visit candidate websites for the most current information.