Mark Baisley

Mark Baisley is a state senator from Roxborough Park, Colorado. A Republican, Baisley represents Colorado's 4th Senate district. Previously, he represented Colorado House of Representatives District 39, which encompassed parts of Douglas County and all of Teller County.

Background

Baisley earned a bachelor's degree with dual degrees in computer information systems and business administration from Columbia College, Missouri in 1993. He currently works as the president of Slipglass, Inc., an engineering software firm.

Electoral history

Baisley was first elected as a state representative in the 2018 general elections. In that election, he defeated his Democratic and Libertarian party opponents, winning 62.61% of the vote.
Baisley was re-elected to the state house in 2020.
In 2022, Baisley ran for a seat in the Colorado State Senate. Specifically, he ran to represent Colorado's 4th Senate district. In the general election, he defeated his Democratic Party opponent, winning 60.84% of the vote.
In March 2025, Baisley announced his candidacy for the 2026 Colorado gubernatorial election. On January 5, 2026, he suspended his campaign for Governor and announced his candidacy for the 2026 United States Senate election.