C.R.S. § 1-12-201: Vacancies in office of United States senator.

(1) When a vacancy occurs in the office of United States senator from the state, the governor shall make a temporary appointment to fill the vacancy until it is filled by election. The governor shall appoint a person who is a member of the same political party as the former United States senator.

(2) When a vacancy occurs, the governor shall direct the secretary of state to include in the general election notice for the next general election a notice of the filling of the vacancy. The secretary of state shall give notice accordingly. At the election, the vacancy shall be filled for the unexpired term. If, for any reason, no United States senator is elected at the next general election, the person temporarily appointed by the governor shall hold the office until a United States senator is elected at a succeeding general election.