Mark Baisley is a Colorado state senator representing the 4th district (2023-present) and aerospace engineer. Born in Hastings, Minnesota in 1955, Baisley holds a B.S. in computer information systems/business administration from Columbia College (1993). He is president of Slipglass, Inc., an engineering software firm, and previously served as a state representative. In January 2026, Baisley withdrew from the Colorado gubernatorial race to run for U.S. Senate instead, saying his background in the Colorado legislature made him better suited for the federal office.
Tech entrepreneur who founded and leads Slipglass, an engineering software company. Previously worked as senior engineer with Raytheon and senior systems engineer with Martin Marietta. Served on Columbia College Board of Trustees and as vice chair and finance chairman of the Republican Party of Colorado. No controversial statements documented in mainstream news coverage prior to 2025.
Libertarian conservative - minimize government
Defines 'affordability' as 'breathing space' between earnings and living costs. Argues larger government reduces that space, causing family stress.
Voting History: State senator with Republican voting record; did not complete Ballotpedia survey providing detailed position information
Socially conservative - critical of LGBTQ+ rights
At 2025 gubernatorial forum, described LGBTQ+ colleagues at statehouse as in 'rebellion against the nature of God' and using state 'as their kind of church to force their religious beliefs on the rest of us'
Voting History: N/A
Libertarian conservative messaging emphasizing government overreach and constitutional concerns
Baisley is 'too extreme for Colorado'
Campaign characterized Baisley as joining Republican group campaigning to 'prove who would be more loyal to Trump'