Obergefell v. Hodges 576 U.S. (Oyez)"ustice Anthony M. Kennedy delivered the opinion for the 5-4 majority. The Court held that the Due Process Clause of the Fourteenth Amendment guarantees the right to marry as one of the fundamental liberties it protects, and that analysis applies to same-sex couples in the same manner as it does to opposite-sex couples. "
https://www.oyez.org/cases/2014/14-556