Mich. Comp. Laws § 168.602

Sec. 602. In a county comprising more than 1 representative or senatorial district, the members of the county committee of each political party residing in each such representative or senatorial district of such county shall constitute a committee of said political party for such representative or senatorial district, as the case may be, and such committee shall elect its chairman and other officers. The chairman shall have the right to vote on all questions arising in said committee.