The 2026 election is over (November 3). Official results are on the Colorado Secretary of State’s website.
Kim MonsonKim Monson · Colorado Voter's Guide 2026

United States Senator

Office
US Senate
On the ballot
9
Incumbent
John Hickenlooper
The people on the ballot01
Mark Baisley
Mark Baisley
Republican
State Senator

Mark Baisley was elected to the Colorado House, District 39, in 2018 and the Colorado Senate, District 4, in 2022. He ran in the Republican primary for Senate District 30 in 2006. The Colorado Senate Republicans' biography says he is president of Slipglass Inc., an engineering software firm, chaired the Douglas County Republican Party, was vice chairman of the state party and earned a bachelor's degree from Columbia College.

2022
Elected to the Colorado Senate, District 4
2018
Elected to the Colorado House of Representatives, District 39
2006
Ran in the Republican primary for the Colorado Senate, District 30
Chairman of the Douglas County Republican Party and vice chairman of the Colorado State Republican Party
President of Slipglass Inc., an engineering software firm, after a 40-year career in information technology
Bachelor's degree, Columbia College
CUT rating

The Colorado Union of Taxpayers (CUT) rates how often legislators vote with its positions on taxes, spending, TABOR and other issues, including property rights and parental rights.

CUT rating (2021): 76.2%
CUT rating (2022): 80.1%
CUT rating (2023): 84%
CUT rating (2024): 76%
CUT rating (2025): 81%
CUT rating (2026): 89.8%
Average of listed CUT ratings (2021, 2022, 2023, 2024, 2025, 2026): 81.2%

The guide gives each listed year equal weight, omits years without a rating and rounds only the final average to one decimal. This is a guide calculation, not a CUT-published lifetime score.

The money
Baisley For Senate
Receipts $138,147.47 · cash on hand $50,021.12
Spent $88,913.26
John Hickenlooper
John Hickenlooper Incumbent
Democrat

John Hickenlooper is the incumbent, elected to this United States Senate seat in 2020. He was Mayor of Denver from 2003 to 2011 and was elected Governor of Colorado in 2010 and re-elected in 2014. He ran for the Democratic nomination for President in 2020. His Senate office biography says he was a geologist and opened the state's first brewpub. He holds bachelor's and master's degrees from Wesleyan University.

2020
Elected to the United States Senate, Colorado
2020
Ran for the Democratic nomination for President
2014
Re-elected Governor of Colorado
2010
Elected Governor of Colorado
2003
Elected Mayor of Denver; served until 2011
A geologist who opened Colorado's first brewpub after being laid off
The money
Hickenlooper For Colorado
Receipts $8,119,380.12 · cash on hand $2,083,870.46
Spent $7,471,142.64
Bob Chew
Bob Chew
Forward

Bob Chew's campaign website says he founded an engineering and technical services company in 1996, sold it to its employees, and stepped down as chief executive in 2022 while remaining board chair. It says he served five years on active duty aboard a Navy nuclear attack submarine, later became a Navy Reserve intelligence officer, and holds a chemical engineering degree from Case Western Reserve University.

Commissioned a Navy ensign; five years on active duty as a division officer aboard a nuclear attack submarine
Later an intelligence officer in the Navy Reserve
1996
Founded an engineering and technical services company, later sold to its employees
2022
Stepped down as its chief executive and stayed on as board chair
Chemical engineering degree, Case Western Reserve University
2017
Moved to Boulder
The money
Bob Chew For Senate
Receipts $1,270,007.00 · cash on hand $1,044,358.31
Spent $225,648.69
Christopher Baum
Christopher Baum
Approval Voting

Christopher Baum ran for the United States House, District 8, in 2024 and for the Colorado House, District 34, in 2022. The Approval Voting Party's biography says he served 20 years in the United States Navy, owned an interior decorating shop, worked as a network administrator for the New Mexico Bar Association, and holds a master's degree in government administration from the University of Pennsylvania.

2024
Ran for the United States House, District 8
2022
Ran for the Colorado House, District 34
Colorado Secretary of State, TRACER candidate registration record
Served twenty years in the United States Navy
Owned an interior decorating shop for 10 years; network administrator for the New Mexico Bar Association for 10 years
Master's degree in government administration, University of Pennsylvania
Gives a Northglenn address in his federal candidate record
Blake Huber
Blake Huber
Libertarian

Blake Huber ran for Colorado Secretary of State in 2018 and for Vice President on the Approval Voting Party ticket in 2016. The Libertarian Party of Colorado's biography says he also ran for President on that ticket in 2020 and 2024, served as a state chair of the Libertarian Party and a member of its national committee, and spent more than 30 years in management.

2024
Ran for President on the Approval Voting Party ticket
2020
Ran for President on the Approval Voting Party ticket
2018
Ran for Colorado Secretary of State
2016
Ran for Vice President on the Approval Voting Party ticket
More than 30 years in management, overseeing apartment communities, a small business and a motel
A state chair of the Libertarian Party and a member of its national committee
Adam Withrow
Adam Withrow
Unity

Adam Withrow ran for the United States House, District 3, in 2024. His campaign website says he has worked as a ranch hand, a certified nursing assistant, a cook, a contractor and a detention officer, and that he studied philosophy, psychology and history in college and left before finishing.

2024
Ran for the United States House, District 3
Has worked as a ranch hand, a certified nursing assistant, a cook, a contractor and a detention officer
Studied philosophy, psychology and history, and left college before finishing
Gives a Walsenburg address in his federal candidate record
DW
Donald Willoughby Write-in
Unaffiliated

Donald Willoughby ran for the United States Senate in Colorado in 2014 and 2016.

2016
Ran for the United States Senate, Colorado
2014
Ran for the United States Senate, Colorado
Gives a Broomfield post office box in his federal candidate record
WP
Will Powers Write-in
Republican
RA
Ryan Apelbaum Write-in
Republican
The money02
Baisley For Senate
Mark Baisley · Receipts $138,147.47 · cash on hand $50,021.12 · Spent $88,913.26
Hickenlooper For Colorado
John Hickenlooper · Receipts $8,119,380.12 · cash on hand $2,083,870.46 · Spent $7,471,142.64
Bob Chew For Senate
Bob Chew · Receipts $1,270,007.00 · cash on hand $1,044,358.31 · Spent $225,648.69
Sources03

The 2026 election is over. Requests for personalized guides closed on November 3, 2026. The full guide remains available to read.

Read the full guide