Mich. Const. art. I, § 25

Marriage. Sec. 25. To secure and preserve the benefits of marriage for our society and for future generations of children, the union of one man and one woman in marriage shall be the only agreementrecognizedasamarriageorsimilarunionforanypurpose. History: Add.Init.,approvedNov.2,2004,Eff.Dec.18,2004.