If the Supreme Court reverses Obergefell and determines bans against marriage equality are not unconstitutional, states with laws protecting same-sex couples' right to marry would need to independently overturn their laws for it to be banned. Those with constitutional amendments protecting marriage equality would have to call a referendum vote to overturn them, and those protected by state Supreme Court rulings - the next highest authority after the U.S. Supreme Court -would need their state's court to agree to hear the case again.