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Republican

Mark Baisley

Republican

Mark Baisley

Colorado Republican Senate nominee?

$13.9K

JUL 1, 2026

Primary Election

Party selects its nominee.

Overview

Current roleState Senator

PartyRepublican

Political ideologyConservative Republican

LocationColorado

BackgroundAerospace engineer

Notable personal detailsMark Baisley is a Republican Colorado state senator representing Senate District 4. He previously served in the Colorado House of Representatives before winning election to the state Senate in 2022. He is an aerospace engineer and, in January 2026, filed to run for the U.S. Senate in Colorado in the 2026 election cycle.

SourcesShow

leg.colorado.gov fec.gov en.wikipedia.org content.leg.colorado.gov coloradopolitics.com qa.coleg.gov axios.com pueblorepublicans.org ballotready.org baisleyforsenate.com politics1.com coloradopols.com douglas.co.us balcerovichcoleman.com spl.cde.state.co.us arxiv.org markbaisley.com newcoloradopromise.com justfacts.votesmart.org coloradosun.com gazette.com app.coloradocapitolwatch.com denvergazette.com coloradonewsline.com denver7.com conservationco.org cpr.org coloradocommunitymedia.com developer.ballotpedia.org help.x.com voterguide.ballotpedia.org cba.ballotpedia.org x.com cdn.ballotpedia.org legal.x.com about.twitter.com congress.gov wikidata.org senate.gov ncsl.org govinfo.gov

Positions

LiberalConservative

Economy & Taxes

Opposes higher taxes and favors limited government to keep more income in residents' hands; supports resisting new government spending and prioritizing affordability through market-driven solutions. Has voted against at least one large state budget appropriation.

Healthcare

Supports market-based healthcare reforms that increase patient choice and reduce insurer/ government control, favoring policies that let patients shop for services and approve treatments rather than rely on insurance bureaucrats. Has sponsored or supported legislation and votes consistent with conservative, market-oriented approaches to health policy, including opposing mandates to expand insurance coverage for specific drugs and sponsoring bills that prioritize state subsidies for lawfully present residents.

Immigration & Border

The candidate has sponsored legislation to require local governments and law enforcement to cooperate with federal immigration authorities and to restore pre-2006 restrictions that limit local policies shielding undocumented immigrants. He frames the proposals as aimed at enabling reporting to ICE and deportation of noncitizens who commit crimes. The legislative effort emphasizes strengthening enforcement rather than expanding legal pathways or asylum protections.

Abortion & Reproductive Rights

Mark Baisley opposes expanded legal abortion rights in Colorado and has acted to restrict or abolish abortion access. He opposed the Reproductive Health Equity Act and voted against measures to enshrine abortion rights, and he is listed as a sponsor on legislation characterized as abolishing abortion in Colorado.

Climate & Energy

The candidate votes in favor of including nuclear energy as a recognized clean energy resource and has voted against state building decarbonization measures; his environmental scorecard from Conservation Colorado is low. His committee assignments include Transportation & Energy, and his legislative record shows opposition to regulatory decarbonization measures while supporting nuclear as part of the clean-energy definition.

Public Safety & Guns

Mark Baisley has opposed recent Colorado legislation to crack down on so-called “ghost guns,” arguing such measures infringe on constitutional rights and proposing amendments to limit enforcement actions. His public comments and floor actions in the State Senate position him against new gun-registration or restriction measures like the ghost-gun bills considered in 2023–2025.

News

AINews Summary

Last updatedMay 19, 2026

Mark Baisley is in the news because he is the unopposed Republican candidate in Colorado’s U.S. Senate primary, according to the state’s certified ballot. Other recent coverage around him is mostly about broader GOP fights over voting rules, abortion restrictions, climate liability, and federal policy, rather than direct actions by Baisley himself. The latest items do not report any major new campaign move or controversy involving him.

leg.colorado.gov+40

Articles

TDThe Denver Post1 month ago