A federal appeals court on Friday affirmed a lower court's ruling striking down Oklahoma's ban on gay marriage.

A three-judge panel of the Tenth Circuit Court of Appeals in Denver declared Oklahoma must allow gay and lesbian couples to marry.

Last month, the same panel upheld a ruling knocking down Utah's ban. Utah officials have since announced they'll ask the Supreme Court to review the case.

(Related: Utah to appeal gay marriage ruling to Supreme Court.)

Plaintiffs Mary Bishop and Sharon Baldwin filed their lawsuit shortly after Oklahoma voters in 2004 overwhelmingly (76%) approved Question 711, which defines marriage as a heterosexual union and prohibits the state from recognizing gay couples with civil unions.

Oklahoma officials appealed U.S. District Judge Terence C. Kern's January ruling declaring the ban invalid.

The Tenth Circuit put its Oklahoma ruling on hold.

“Today's ruling arises out of the oldest active marriage case in the country, filed in Oklahoma ten years ago; and follows more than two dozen favorable rulings for marriage in the past year,” Evan Wolfson, president of Freedom to Marry, said in a statement. “The legal consensus is clear: Marriage discrimination is unconstitutional and inflicts concrete harms on committed gay and lesbian couples and their families. From the heart of the Southwest and as far as the Mountain West, the federal rulings from the 10th Circuit Court of Appeals from Oklahoma and Utah affirm that all of America is ready for the freedom to marry. It is time for the Supreme Court to end this patchwork of discrimination and bring our country to national resolution as soon as possible.”