Democratic Sen. Tim Carpenter unveiled the amendment in the state Capitol flanked by a longtime gay couple from Madison and Rep. JoCasta Zamarripa, a bisexual Milwaukee Democrat.
Wisconsin’s remaining 14 Democratic senators co-sponsored the legislation, which faces an uphill battle in the Republican-controlled Legislature.
The proposal comes a week after the American Civil Liberties Union filed a lawsuit that also challenges the state’s gay marriage law.
Fifty-nine percent of voters passed the ban in 2006.
This material may not be published, broadcast, rewritten, or redistributed.