Actually, the Supreme Court has said that there is a right to marry. http://afer.org/blog/14-supreme-court-cases-marriage-is-a-fundamental-right/ lists fourteen Supreme Court cases sayin so  For just one example, from Loving v. Virginia, 388 U.S. 1 (1967): “The freedom to marry has long been recognized as one of the vital personal rights essential to the orderly pursuit of happiness by free men.”

Incidentally, Marty, that is an example of how the reasoning in Loving is the same as the reasoning in Obergefell.