There shall be maintained a Legislative Commissioners’ Office for the use and information especially of the members of the General Assembly, the officers of the several state agencies and the public. Said office shall be under the general direction of two legislative commissioners. Biennially one commissioner shall be appointed by the General Assembly to hold office for four years from the first day in July in the year of his appointment and until his successor has been appointed and has qualified. Said commissioners shall not be of the same political party. Each commissioner shall be an attorney at law and shall have been admitted to practice before the courts of the state of Connecticut for at least six years prior to his appointment. The salary of each commissioner shall be established by the Joint Committee on Legislative Management.