Jennifer Tyrrell and Zach Wahls have joined the effort to repeal Ohio's constitutional amendment banning gay marriage.

The 2004 voter-approved amendment prevents the state from recognizing any union other than a heterosexual marriage.

Tyrrell, the Belmont County mom who last year was ousted as den leader of her son's Boy Scout troop because she is a lesbian, has been an outspoken opponent of the Boy Scouts of America's (BSA) ban on openly gay scouts and leaders.

Wahls is the founder of Scouts for Equality, a leading voice calling for an end to the ban. He came to prominence defending his two-mom family at an Iowa House hearing considering a proposed measure which would repeal the state's gay marriage law by defining marriage as a heterosexual union in the Iowa Constitution. A video of Wahls' testimony attracted more than 18.3 million views on YouTube to become the site's most-watched video of 2011.

The effort to repeal the amendment began last year. The group FreedomOhio is in the process of collecting the roughly 385,000 valid signatures needed by July 3 to qualify for this November's ballot. The group has said that it expects to meet the deadline.