(DENVER) – A panel of the 10th U.S. Circuit Court of Appeals will hear a case from Oklahoma on Thursday.
The courtroom in Denver will begin hearing oral arguments in Bishop v. Smith, a landmark case that could strike down Oklahoma's gay marriage ban.
Mary Bishop and Sharon Baldwin, of Tulsa, have been fighting the ban for years.
The two cases are very similar.
A week ago the court heard the appeal of a judge's ruling that found Utah's gay marriage ban is unconstitutional.
Both cases mark the first time an appeals court has considered gay marriage since a big U.S. Supreme Court ruling last year shook up the legal landscape.
It could be months before the judges rule on the two cases.
Their decision almost certainly will be appealed. The Supreme Court likely will have the final word on gay marriage.