
Candidate for U.S. Senator
Mark Baisley
Baisley is a former aerospace engineer and software company leader who has served in the Colorado legislature since 2019, first in the House and now in the Senate. He left the 2026 governor's race in January to run for U.S. Senate and was unopposed in the Republican primary. His campaign focuses on reducing the size of government, property taxes, homeownership costs, water storage and immigration enforcement.
- Current or most recent role
- Colorado State Senator, District 4 (since 2023)
- Hometown
- Woodland Park
- Campaign website
- baisleyforsenate.com
Why they say you should vote for them
The candidate's own case to voters, summarized from their campaign and public statements.
- Says his mission is "Securing Liberty and Protecting Colorado Families."[1]
- Says his primary goal in the Senate would be to "recapture affordability by reducing the footprint of government."[4]
- Describes himself as an engineer committed to solving real problems, citing his role in Colorado's quantum computing Tech Hub designation and artificial intelligence legislation he introduced.[1]
- Says he respects colleagues on the other side of the aisle and points to a report that 14 of his 18 prime-sponsored bills passed while Republicans were in the legislative minority.[4]
Background
- State Senator, District 4, Colorado Senate · 2023–present[3],[6]
- Co-chair, Colorado Senate Aerospace and Defense Caucus · Current[1],[4]
- State Representative, District 39, Colorado House of Representatives · 2019–2023[3]
- Chairman, Colorado Space Business Roundtable · Not stated[1]
- President, Slipglass, Inc. (engineering software company) · Current[3],[1]
- Aerospace engineer, Martin Marietta, Hughes, Raytheon and NASA's Jet Propulsion Laboratory · Earlier career[1]
- Member, Board of Trustees (12 years), Columbia College (Missouri) · Not stated[1]
Education
Where they stand
- TaxesSupports cutting federal taxes and regulations. Proposes removing property values from property tax calculations and cites his 2024 resolution aimed at "eliminating the wild swings in property taxes."[2],[4],[5]
- HousingProposes incentives for lenders so first-time homebuyers can get mortgage rates "pegged to the 10-year U.S. Treasury yield."[4],[5]
- ImmigrationSupports a vetted legal immigration system of about 1.2 million people a year and stronger enforcement. Says he would encourage the Department of Homeland Security to "only use nonlethal force" when arresting people who interfere with enforcement.[2],[5]
- Energy & EnvironmentSupports expanding water storage within existing interstate compacts, faster permits for storage facilities, and more tunnels to move Western Slope water to the Front Range. Supports expanding domestic energy production.[2],[4],[5]
- Health CareDescribes the health care system as broken and supports restoring free-market forces, including Sen. Rick Scott's plan for health-savings-style accounts.[5]
- Public SafetySupports funding for law enforcement and ending programs that he says release violent offenders before they are rehabilitated.[2]
- AgricultureProposes a Farm Prosperity and Cost Relief Act, including making lease payments for farm equipment fully deductible, and favors "freer markets rather than expanded bureaucracy."[2],[5]
- EducationProposes requiring universities that benefited from the federalization of student loans to use their endowments to address student debt.[5]
Voting record
A selection of notable recorded votes. Not a complete record.
| Measure | Vote | Date |
|---|---|---|
| SB23-188 – Protections for Accessing Reproductive Health Care Adds legal protections for patients and providers of reproductive and gender-affirming health care in Colorado, including limits on penalties from insurers and licensing boards. (Colorado Senate) | No[7] | Mar 22, 2023 |
| HB24-1313 – Housing in Transit-Oriented Communities Requires certain local governments near transit to allow a minimum level of housing density near transit stations and corridors. (Colorado Senate) | No[8] | May 7, 2024 |
| HB24B-1001 – Property Tax (2024 special session) Lowers property tax assessment rates and changes limits on property tax revenue growth for local governments and school districts. (Colorado Senate) | No[9] | Aug 29, 2024 |
| SB25-003 – Semiautomatic Firearms & Rapid-Fire Devices Restricts sales of certain semiautomatic firearms with detachable magazines unless buyers complete a safety course, starting Aug. 1, 2026. (Colorado Senate) | No[10] | Feb 18, 2025 |
| SB25-276 – Protect Civil Rights Immigration Status Limits collection and sharing of personal information and cooperation with federal civil immigration enforcement by state and local entities, and removes affidavit requirements for in-state tuition and state IDs. (Colorado Senate) | No[11] | Apr 21, 2025 |
In their words
“The primary way of addressing affordability is to reduce the burden of government.”
“I respect my colleagues on the other side of the aisle”
“We need to add to the tunnels and storage”
Sources
- Mark Baisley for U.S. Senate, Baisley campaign
- Issues, Baisley campaign
- Mark Baisley, Wikipedia
- Colorado U.S. Senate: Baisley looks to unseat Hickenlooper, Colorado Politics, October 2, 2026
- Q&A: Meet the candidates running to represent Colorado in the US Senate, Post Independent, October 8, 2026
- Senator Mark Baisley, Colorado General Assembly
- SB23-188 Senate third reading vote record, Colorado General Assembly, March 22, 2023
- HB24-1313 Senate third reading vote record, Colorado General Assembly, May 7, 2024
- HB24B-1001 Senate third reading vote record, Colorado General Assembly, August 29, 2024
- SB25-003 Senate third reading vote record, Colorado General Assembly, February 18, 2025
- SB25-276 Senate third reading vote record, Colorado General Assembly, April 21, 2025
Photo: Official portrait, Colorado General Assembly (Official government portrait).
Last reviewed October 10, 2026. Spot an error or something missing? Report a correction.
Also running for U.S. Senator
- Christopher Baum (Approval Voting Party)
- Bob Chew (Forward Party)
- John Hickenlooper (Democratic)
- Blake Huber (Libertarian)
- Adam Withrow (Unity Party)