Wis. Const. art. XIII, § 13
[As created Nov. 2006]
[2003 J.R. 29, 2005 J.R. 30, vote Nov. 2006]
Only a marriage between one man and one woman shall be valid or recognized as a marriage in this state. A legal status identical or substantially similar to that of marriage for unmarried individuals shall not be valid or recognized in this state.