State Sen. Mark Baisley secured the Colorado Republican Party's sole endorsement for the U.S. Senate primary ballot at the state assembly on April 11-12, 2026, after rivals including Dathan Jones, George Washington Markert, and Janak Joshi failed to advance, driving his trader consensus to 95.8%. This unopposed party backing, reflecting strong delegate support in a process where 30% of attendees can qualify candidates, positions him as the presumptive nominee ahead of the June 30 primary election. While challengers could still petition onto the ballot with sufficient signatures before the filing deadline, traders assign minimal probabilities due to logistical hurdles and Baisley's momentum; realistic shifts would require a late scandal, major endorsement reversal, or surprise voter turnout favoring a write-in effort.