Section 1. There shall be a commission on judicial conduct consisting of nine members. Three judges shall be appointed by the justices of the supreme judicial court, none of whom shall be justices of said court and no two of whom shall be from the same department of the trial court. Three members of the bar shall be appointed by the chief justice of the trial court, none of whom shall be judges. Three members shall be appointed by the governor, none of whom shall be members of the bar. The members of the commission shall serve without compensation, but shall be reimbursed for all expenses reasonably incurred by them in the performance of their duties. Members of the commission shall serve for six year terms. Commission membership shall terminate if a member ceases to be qualified for the appointment. A vacancy shall be filled by the appointing authority for the remainder of the term. Upon the expiration of the term of office of a member, his successor shall be appointed in the manner aforesaid. No person shall succeed himself as a member of the commission except when his membership is due to an appointment to fill a vacancy for the remainder of an unexpired term. One or more alternate members, as necessary, shall be selected in the manner prescribed for initial appointments in each representative class, and shall serve at the call of the chairman to take the place of those who are disqualified from participating in a commission proceeding pursuant to commission rules.