Mich. Comp. Laws § 168.597

Sec. 597. At its spring state convention in each odd numbered year, each political party shall select a state central committee as herein provided, which committee shall consist of 2 men and 2 women from each congressional district. The state convention shall select a chairman and 2 vice chairmen of the state central committee and such chairman and vice chairmen shall have the right to vote on all questions arising in the committee. The state central committee so constituted shall appoint a secretary and a treasurer and such other officers as in its judgment may be proper and shall have the power to fill any vacancy that may occur in its membership or any of its offices. The term of service of a state central committee shall continue until the election of its successor.