Mich. Comp. Laws § 168.178: State senators and representatives; vacancy in office; special election.

Sec. 178.

The governor may call a special election as provided in section 634 in any senatorial or representative district of the state when the right of office of a person elected state senator or representative shall cease before the commencement of the term of service for which the state senator or representative was elected, or whenever a vacancy occurs in the office of state senator or representative after the term of service has begun for which the state senator or representative was elected.