The text of the adopted amendment, which became Article XIII, Section 13 of the state constitution, reads:
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.
As required by the constitution, the amendment was approved by both houses of the legislature, in two consecutive sessions. The legislative history of the amendment is as follows:
In April 2009 the Wisconsin Supreme Court was asked in McConkey v. Van Hollen to rule on whether the 2006 Referendum 1 was constitutional. William McConkey, a political science instructor, claimed that the measure violated the state's constitution because it proposed more than one question in a single ballot proposal, which is impermissible under Wisconsin law. On June 30, 2010, the Court ruled that the amendment is constitutional.