As the Columbus Dispatch puts it:
It will be the single-largest legal event in the same-sex marriage debate since June 26, 2013, when the U.S. Supreme Court declared part of the federal Defense of Marriage Act to be unconstitutional. Since then, every major federal and state court ruling nationwide has gone in favor of gay-marriage proponents. The Cincinnati hearings are expected to draw such large crowds of journalists and spectators to the Potter Stewart U.S. Courthouse that the clerk of the 6th U.S. Circuit Court of Appeals has set up two overflow courtrooms equipped with piped-in audio of the proceedings. All five cases will be heard by the same three-judge panel, consisting of former Ohio Supreme Court Justice Deborah L. Cook, 62; ex-state Solicitor Jeffrey Sutton, 53; and Martha Craig “Cissy” Daughtrey, 72. Daughtrey was appointed by President Bill Clinton in 1993, while Cook and Sutton were picked by President George W. Bush in 2003.The 6th Circuit is considered relatively conservative so even though marriage equality is on an unprecedented winning streak in federal court, a win from this court would be something of a surprise.