2026 United States Senate election in Colorado

The 2026 United States Senate election in Colorado will be held on November 3, 2026, to elect a member of the United States Senate to represent the state of Colorado. Primary elections will be held on June 30, 2026. Incumbent Democratic senator John Hickenlooper, who was first elected in 2020, has stated that he plans to run for re-election. He has also said that this will be his last campaign for Senate.^[1]

Democratic primary

Candidates

Declared

Karen Breslin, college professor, candidate for U.S. Senate in 2022, and candidate for Colorado's 4th congressional district in 2024^[2]
John Hickenlooper, incumbent U.S. Senator^[1]

Filed paperwork

Nichole Miner, college student^[3]

Endorsements

John Hickenlooper

Organizations

AIPAC^[4]
Giffords^[5]

Fundraising

Campaign finance reports as of June 30, 2025
Candidate	Raised	Spent	Cash on hand
Karen Breslin (D)	$13,012	$6,853	$6,159
John Hickenlooper (D)	$4,778,005	$3,648,740	$2,771,347
Source: Federal Election Commission^[6]

Republican primary

Candidates

Declared

Janak Joshi, former state representative from the 16th district (2011–2017) and candidate for Colorado’s 8th congressional district in 2024^[7]
George Markert, AI strategic advisor^[8]

Filed paperwork

Dathan Jones^[9]

Potential

Heidi Ganahl, former at-large member of the University of Colorado Board of Regents (2017–2023) and nominee for governor in 2022^[8]

Declined

Brandi Bradley, state representative from the 39th district (2023–present)^[8]

Endorsements

George Markert

U.S. representatives

Tom Tancredo, former U.S. representative from Colorado's 6th congressional district (1999–2009)^[10]

Fundraising

Campaign finance reports as of June 30, 2025
Candidate	Raised	Spent	Cash on hand
George Markert (R)	$98,564	$40,819	$57,745
Source: Federal Election Commission^[6]

Independent candidates

Candidates

Filed paperwork

Clinton Roosevelt Dale^[11]
Joshua William Kuebler^[12]

General election

Predictions

Source	Ranking	As of
Inside Elections^[13]	Solid D	August 12, 2025
The Cook Political Report^[14]	Solid D	August 18, 2025
Sabato's Crystal Ball^[15]	Safe D	August 12, 2025
Race To The WH^[16]	Safe D	September 4, 2025

References

^ ^a ^b Sarles, Jesse (August 22, 2024). "Sen. John Hickenlooper says his re-election bid in two years will be his last campaign for Senate". CBS News. Retrieved December 6, 2024.
^ "Breslin 2026 U.S. Senate Campaign Seeks Volunteers" (Press release). February 12, 2025. Retrieved February 19, 2025 – via University of Colorado Denver.
^ Young, Quentin (April 3, 2025). "Hickenlooper could be vulnerable to a strong primary challenge in 2026". Colorado Newsline. Retrieved April 3, 2025.
^ "- AIPAC Political Portal". candidates.aipacpac.org. Retrieved April 28, 2025.
^ "GIFFORDS PAC endorses Colorado Sen. John Hickenlooper for reelection". GIFFORDS. July 28, 2025. Retrieved July 29, 2025.
^ ^a ^b "2026 Election United States Senate - Colorado". fec.gov. Federal Election Commission. Retrieved April 23, 2025.
^ Luning, Ernest (July 8, 2025). "Republican Janak Joshi files to challenge John Hickenlooper in Colorado's 2026 US Senate race". Colorado Politics. Retrieved July 9, 2025.
^ ^a ^b ^c Paul, Jesse (July 1, 2025). "John Hickenlooper is up for reelection. Colorado Republicans don't really have a candidate to challenge him". The Colorado Sun. Retrieved July 1, 2025.
^ "FEC Form 2 for Report FEC-1919496". docquery.fec.gov. Retrieved October 15, 2025.
^ Luning, Ernest (August 26, 2025). "Tom Tancredo endorses Hickenlooper challenger George Markert in Colorado's GOP US Senate primary". Colorado Politics. Retrieved October 9, 2025.
^ "Statement of Candidacy". March 2, 2023. Retrieved April 16, 2025.
^ "Statement of Candidacy". August 1, 2024. Retrieved April 16, 2025.
^ "Senate Ratings". Inside Elections. Retrieved January 14, 2025.
^ "2026 CPR Senate Race Ratings". Cook Political Report. Retrieved February 11, 2025.
^ "2026 Senate ratings". Sabato's Crystal Ball. Retrieved February 13, 2025.
^ "2026 Senate Forecast". Race to the WH. Retrieved March 19, 2025.

External links

Official campaign websites

[CBS-22A-1] Sarles, Jesse (August 22, 2024). "Sen. John Hickenlooper says his re-election bid in two years will be his last campaign for Senate". CBS News. Retrieved December 6, 2024.

[2] "Breslin 2026 U.S. Senate Campaign Seeks Volunteers" (Press release). February 12, 2025. Retrieved February 19, 2025 – via University of Colorado Denver.

[3] Young, Quentin (April 3, 2025). "Hickenlooper could be vulnerable to a strong primary challenge in 2026". Colorado Newsline. Retrieved April 3, 2025.

[4] "- AIPAC Political Portal". candidates.aipacpac.org. Retrieved April 28, 2025.

[5] "GIFFORDS PAC endorses Colorado Sen. John Hickenlooper for reelection". GIFFORDS. July 28, 2025. Retrieved July 29, 2025.

[FEC1-6] "2026 Election United States Senate - Colorado". fec.gov. Federal Election Commission. Retrieved April 23, 2025.

[7] Luning, Ernest (July 8, 2025). "Republican Janak Joshi files to challenge John Hickenlooper in Colorado's 2026 US Senate race". Colorado Politics. Retrieved July 9, 2025.

[DontReally-8] Paul, Jesse (July 1, 2025). "John Hickenlooper is up for reelection. Colorado Republicans don't really have a candidate to challenge him". The Colorado Sun. Retrieved July 1, 2025.

[9] "FEC Form 2 for Report FEC-1919496". docquery.fec.gov. Retrieved October 15, 2025.

[10] Luning, Ernest (August 26, 2025). "Tom Tancredo endorses Hickenlooper challenger George Markert in Colorado's GOP US Senate primary". Colorado Politics. Retrieved October 9, 2025.

[11] "Statement of Candidacy". March 2, 2023. Retrieved April 16, 2025.

[12] "Statement of Candidacy". August 1, 2024. Retrieved April 16, 2025.

[13] "Senate Ratings". Inside Elections. Retrieved January 14, 2025.

[14] "2026 CPR Senate Race Ratings". Cook Political Report. Retrieved February 11, 2025.

[15] "2026 Senate ratings". Sabato's Crystal Ball. Retrieved February 13, 2025.

[16] "2026 Senate Forecast". Race to the WH. Retrieved March 19, 2025.

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Democratic primary

Candidates

Declared

Filed paperwork

Endorsements

Fundraising

Republican primary

Candidates

Declared

Filed paperwork

Potential

Declined

Endorsements

Fundraising

Independent candidates

Candidates

Filed paperwork

General election

Predictions

See also

References

External links