Colorado constitution
Article IV
Section 13

(7) In the event that the offices of both the governor and lieutenant governor are vacant at the same time for any of the reasons enumerated in subsections (1), (2), and (3) of this section, the successor to fill the vacancy in the office of governor shall be the first named of the following members of the general assembly who is affiliated with the same political party as the governor: President of the senate, speaker of the house of representatives, minority leader of the senate, or minority leader of the house of representatives; except that if the governor and none of said members of the general assembly are affiliated with the same political party, the vacancy shall be filled by one such member in the order of precedence listed in this subsection (7). The member filling the vacancy pursuant to this subsection (7) shall take the oath of office of governor and shall become governor. The office of lieutenant governor shall be filled in the same manner as prescribed in subsection (3) of this section when the lieutenant governor elect fails to assume the office of lieutenant governor.