Compiled Laws, Chapter 168. Michigan Election Law § 168.590b

Sec. 590b. (1) Except as provided in subsection (2) and subject to the requirements prescribed in subsections (3) and (4), a qualifying petition for an office shall be signed by a number of qualified and registered electors of the district that is represented by the office being sought by the candidate equal to not less than 2% of the total number of votes cast for all candidates for governor in the district at the last election in which a governor was elected. In any case, at least 15 signatures shall be submitted.

(2) Subject to the requirements of subsections (3) and (4), if a qualifying petition is for a statewide elective office, the qualifying petition shall be signed by a number of qualified and registered electors of this state equal to not less than 1% of the total number of votes cast for all candidates for governor at the last election in which a governor was elected.

(3) All signatures on a qualifying petition shall be obtained not more than 180 days immediately before the date of filing under section 590c.  1

(4) As part of the minimum number of required signatures under this section, a qualifying petition for the office of president of the United States, United States senator, governor, attorney general, secretary of state, state board of education, board of regents of the university of Michigan, board of trustees of Michigan state university, board of governors of Wayne state university, or justice of the supreme court shall be signed by at least 100 registered electors in each of at least 1/2 of the congressional districts of the state.