Jim Obergefell speaking at the Black Tie Dinner in Dallas in 2017. Jim Obergefell, the named plaintiff in the marriage equality lawsuit that legalized same-sex marriage, announced he is running for Congress.

Obergefell will run for the 89th House district that is currently held by a Republican. But the district lines are still under review.

Last week, the Ohio Supreme Court ruled the newly drawn maps violate the state constitution, which forbids partisan gerrymandering.