(a) The position of presiding officer rotates among the governor, lieutenant governor, and speaker of the house of representatives. A term as presiding officer is two years and expires on January 31 of each odd-numbered year.
(b) The commission members who are eligible to serve but are not serving as the presiding officer under Subsection (a) shall serve as joint assistant presiding officers for two-year terms expiring on January 31 of each odd-numbered year.