Sharon Baldwin (left) and Mary Bishop speak at East Central University in Ada, Okla., on Thursday, Oct. 10, 2013, as part of the ECU Gay-Straight Alliance's National Coming Out Day event. The women are two of four plaintiffs in a lawsuit filed in November 2004 in federal court in Tulsa, Okla., challenging the federal Defense of Marriage Act and the Oklahoma Constitution's ban on same-sex marriage. (AP Photo/Eric Turner)

Photo by: Eric Turner

Sharon Baldwin (left) and Mary Bishop speak at East Central University in Ada, Okla., on Thursday, Oct. 10, 2013, as part of the ECU Gay-Straight Alliance's National Coming Out Day event. The women are two of four plaintiffs in a lawsuit filed in November 2004 in federal court in Tulsa, Okla., challenging the federal Defense of Marriage Act and the Oklahoma Constitution's ban on same-sex marriage. (AP Photo/Eric Turner)