Mark Baisley secured the Republican nomination for U.S. Senate in Colorado through the state party assembly process in April 2026, where he alone reached the 30 percent threshold required to qualify directly for the June 30 primary ballot. Rivals including Janak Joshi and George Washington Markert fell short and were eliminated at the convention, while Dathan Jones and others did not advance via petition or assembly support, leaving Baisley unopposed. With ballots distributed and the primary just days away, trader consensus reflects these procedural barriers to competition. Late write-in efforts or unresolved legal challenges remain theoretically possible before certification but face significant structural hurdles under Colorado election rules.