Mark
Baisley
Colorado state senator and aerospace engineer running as 2026 Republican U.S. Senate challenger in Colorado
- sources
- 20
- positions
- 12
- endorsements
- 39
Background
Mark Baisley is a Republican Colorado state senator representing Senate District 4, based in Woodland Park, Colorado. He was first elected to the Colorado House of Representatives in 2018, serving from 2019 to 2023, and was subsequently elected to the Colorado Senate in 2022, where he has served since 2023. 12224
Before entering politics, Baisley worked as an aerospace engineer with Martin Marietta, Hughes, Raytheon, and NASA's Jet Propulsion Laboratory. He currently leads Slipglass Inc., a Colorado software company developing interactive systems visualization technology. He holds a bachelor's degree from Columbia College with majors in Computer Information Systems and Business Administration. 124
In 2026, Baisley is the Republican nominee challenging incumbent Democratic U.S. Senator John Hickenlooper in the November 3, 2026, U.S. Senate election in Colorado. The FEC lists him as a challenger. 68
At a glance
- Party
- Republican
- Running for
- U.S. Senate, Colorado
- Election
- Nov 3, 2026
- Current office
- Colorado State Senator, Senate District 4
- Website
- baisleyforsenate.com(opens in a new tab)
Where they stand
Each position links to the page it was drawn from. Quotes are verbatim.
Timeline
- Nov 3filingColorado general election scheduled; Baisley faces incumbent Hickenlooper
Colorado's general election is scheduled for November 3, 2026. Baisley, a Republican state senator, is challenging Democratic incumbent John Hickenlooper.
Republican candidate looks to unseat Colorado senator ... · Oct 10, 2026 (opens in a new tab) - Oct 14debate9NEWS debate between Baisley and Hickenlooper scheduled at MSU Denver
A debate moderated by 9NEWS journalists Kyle Clark and Marshall Zelinger is scheduled at Metropolitan State University of Denver, to be broadcast on KTVD and streamed by 9NEWS.
9NEWS U.S. Senate Debate at MSU Denver · Oct 8, 2026 (opens in a new tab) - Oct 11debateBaisley debates Hickenlooper at Colorado State University in Colorado Sun-hosted event
The Colorado Sun and Noticias Univision Colorado hosted a U.S. Senate debate between Hickenlooper and Baisley at Colorado State University, scheduled for noon on October 11.
Watch: The Colorado Sun hosts U.S. Senate candidate debate · Oct 11, 2026 (opens in a new tab) - Oct 11pollRace rated Solid D by Cook Political Report, Safe D by Sabato's Crystal Ball; no public polls logged
A polling tracker reported no public polls logged for the Colorado Senate race and no polling average for the 14 days through October 11. Cook Political Report rated the race Solid D and Sabato's Crystal Ball rated it Safe D.
Colorado Senate Race 2026: Hickenlooper vs. Baisley Polls · Oct 11, 2026 (opens in a new tab) - Oct 10endorsementBaisley says he supports Victor Marx for governor in Denver7 interview
In a Denver7 interview, Baisley said he generally withholds endorsements but noted two exceptions. He stated, 'I support Victor Marx for governor.' The report did not identify any outside endorsements of Baisley himself.
Republican candidate looks to unseat Colorado senator ... · Oct 10, 2026 (opens in a new tab) - Oct 8endorsementBaisley says Western Slope legislators and county commissioners have endorsed him
In a Vail Daily candidate Q&A, Baisley stated that several Western Slope state legislators and county commissioners had endorsed him, though the available excerpt did not name them.
Q&A: Meet the candidates running to represent Colorado in ... · Oct 8, 2026 (opens in a new tab) - Oct 6newsBaisley has released no statewide advertising as Hickenlooper launches first general-election TV ad
The Denver Gazette reported that Baisley had not yet released statewide advertising, while Hickenlooper launched his first general-election television ad. Baisley's reported cash on hand as of June 30 was about $50,000, compared to Hickenlooper's just over $2 million.
Democrat Hickenlooper takes aim at Iran war in 1st general ... · Oct 6, 2026 (opens in a new tab) - Oct 2newsBaisley outlines affordability, housing, and water priorities in Colorado Politics profile
In a Colorado Politics candidate profile, Baisley named affordability, property taxes, and first-time homeownership among his priorities. He said his primary goal would be to reduce the footprint of government and proposed lender incentives tied to the 10-year Treasury yield for first-time buyers, as well as more water infrastructure for the Front Range.
Colorado U.S. Senate | Baisley looks to unseat Hickenlooper · Oct 2, 2026 (opens in a new tab) - Sep 19debateBaisley appears at Club 20 debate in Grand Junction without Hickenlooper
At the Club 20 debates in Grand Junction, Baisley appeared on stage while Hickenlooper skipped the event. Both candidates had been scheduled to debate in October.
At Club 20 debates, who didn't show up was part of the story · Sep 23, 2026 (opens in a new tab) - Sep 14newsBaisley campaign announces Farm Prosperity and Cost Relief Act proposal
Baisley's campaign released a proposed Farm Prosperity and Cost Relief Act, described as using targeted, market-based reforms to reduce federal tax and regulatory burdens on agricultural producers. This is a campaign proposal; no legislation has been introduced or enacted.
Senator Mark Baisley Releases Farm Prosperity Proposal to ... · Sep 14, 2026 (opens in a new tab) - Jun 30filingBaisley wins Republican nomination unopposed in primary
Mark Baisley secured the Republican nomination for Colorado's U.S. Senate seat unopposed in the primary, with his cash on hand reported at about $50,000 as of the June 30 quarter-end filing.
Compare Colorado Senate candidates 2026 | Smarter.Vote · Oct 9, 2026 (opens in a new tab)
Endorsements
- Coloradans for Safer Neighborhoods organizationListed as endorsing organization on iVoterGuide 2026 general-election profile. ivoterguide.com
- John Carson officialCurrent Colorado State Senator; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Cory Applegate officialCounty Commissioner; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Sean Pond officialCounty Commissioner; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Colorado State Shooting Association (CSSA) organizationListed on iVoterGuide primary (June 30) profile; noted as primary-election endorsement. ivoterguide.com
- Hank Brown officialFormer U.S. Senator; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Bill Owens officialFormer Colorado Governor; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Cleave Simpson officialCurrent Colorado State Senator; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Byron Pelton officialCurrent Colorado State Senator; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Larry Liston officialCurrent Colorado State Senator; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Scott Gessler officialFormer Colorado Secretary of State; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Bob Campbell officialCounty Commissioner; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Lauren Boebert officialU.S. Representative; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Jason Mikesell officialTeller County Sheriff; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Erik Stone officialCounty Commissioner; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Perry Will officialCounty Commissioner; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Bill Canda officialCounty Commissioner; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Colorado Medical Society PAC (COMPAC) organizationListed as endorsing organization on iVoterGuide 2026 general-election profile. ivoterguide.com
- Colorado Chamber of Commerce organizationListed as endorsing organization on iVoterGuide 2026 general-election profile. ivoterguide.com
- Colorado Young Republicans organizationListed as endorsing organization on iVoterGuide 2026 general-election profile. ivoterguide.com
- Bob Schaffer officialFormer U.S. Representative; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Paul Lundeen officialFormer Colorado State Senator; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Dan Williams officialCounty Commissioner; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Stand For Health Freedom organizationListed as endorsing organization on iVoterGuide 2026 general-election profile; marked as received after panel-evaluation deadline. ivoterguide.com
- Jeff Crank officialU.S. Representative; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Larry Crowder officialFormer Colorado State Senator; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Perry Buck officialCounty Commissioner; listed on Baisley campaign endorsement page. baisleyforsenate.com
- National Rifle Association Political Victory Fund (NRA-PVF) organizationListed as endorsing organization on iVoterGuide 2026 general-election profile. ivoterguide.com
- Gabe Evans officialU.S. Representative; listed on Baisley campaign endorsement page. baisleyforsenate.com
- John Cooke officialFormer Colorado State Senator; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Kevin Van Winkle officialCounty Commissioner; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Rocky Mountain Gun Owners Super PAC organizationListed as endorsing organization on iVoterGuide 2026 general-election profile. ivoterguide.com
- Jeff Hurd officialU.S. Representative; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Greg Brophy officialFormer Colorado State Senator; listed on Baisley campaign endorsement page. baisleyforsenate.com
- Amy Mitchell officialCounty Commissioner; listed on Baisley campaign endorsement page. baisleyforsenate.com
- National Federation of Independent Business (NFIB) Colorado organizationListed as endorsing organization on iVoterGuide 2026 general-election profile; marked as received after panel-evaluation deadline. ivoterguide.com
- Steve Reams officialWeld County Sheriff; endorsement reported in campaign post dated June 29, 2026. baisleyforsenate.com · Jun 29, 2026
- Rich Smith officialCuster County Sheriff; endorsement reported in campaign post dated June 29, 2026. baisleyforsenate.com · Jun 29, 2026
- Darren Weekly officialDouglas County Sheriff; endorsement reported in campaign post dated June 29, 2026. baisleyforsenate.com · Jun 29, 2026
Campaign finance
Totals filed with the Federal Election Commission for the 2026 election cycle.
- Raised
- $138K
- Spent
- $111K
- Cash on hand
- $28K
As of Sep 30, 2026. Filings are periodic, so recent money may not be included yet. ↳ FEC record S6CO00507(opens in a new tab)
Sources 20
- [1] Colorado Senate Race 2026: Hickenlooper vs. Baisley Polls(opens in a new tab) Oct 11, 2026
- [2] Watch: The Colorado Sun hosts U.S. Senate candidate debate(opens in a new tab) Oct 11, 2026
- [3] Republican candidate looks to unseat Colorado senator ...(opens in a new tab) Oct 10, 2026
- [4] Compare Colorado Senate candidates 2026 | Smarter.Vote(opens in a new tab) Oct 9, 2026
- [5] Mark Baisley - iVoter Guide(opens in a new tab) Oct 9, 2026
- [6] Voter Guide Profile for CO U.S. Senator candidate - Mark Baisley(opens in a new tab) Oct 9, 2026
- [7] 9NEWS U.S. Senate Debate at MSU Denver(opens in a new tab) Oct 8, 2026
- [8] Opinion | Baisley: I will aim to reduce the footprint of government in ...(opens in a new tab) Oct 8, 2026
- [9] Q&A: Meet the candidates running to represent Colorado in ...(opens in a new tab) Oct 8, 2026
- [10] Democrat Hickenlooper takes aim at Iran war in 1st general ...(opens in a new tab) Oct 6, 2026
- [11] John Hickenlooper and Mark Baisley on the issues(opens in a new tab) Oct 5, 2026
- [12] Colorado U.S. Senate | Baisley looks to unseat Hickenlooper(opens in a new tab) Oct 2, 2026
- [13] Mark Baisley on Gun Control - OnTheIssues.org(opens in a new tab) Sep 27, 2026
- [14] US Senate: Republican Mark Baisley(opens in a new tab) Sep 25, 2026
- [15] At Club 20 debates, who didn't show up was part of the story(opens in a new tab) Sep 23, 2026
- [16] Endorsements - Mark Baisley for United States Senate(opens in a new tab) Sep 16, 2026
- [17] Issues - Mark Baisley for United States Senate(opens in a new tab) Sep 15, 2026
- [18] Senator Mark Baisley Releases Farm Prosperity Proposal to ...(opens in a new tab) Sep 14, 2026
- [19] 7-2-2026 State Senator Mark ...(opens in a new tab) Jun 29, 2026
- [20] Mark Baisley(opens in a new tab) Jun 15, 2026