Much to the horror of the hard religious right and social conservatives. 

Personally, I’d be much happier if government would just GTFO of marriage and let the individuals make contracts among themselves. Defense of personal liberty and the enforcement of contracts should be two of the core reaponsibilities of government.

I was surprised when I heard that Justice Thomas dissented, because I’ve always considered him such a strong proponent of liberty. His basic idea was that the gay couples were not restricted from liberty by the band as specified under the Fifth and Fourteenth Amendments would have my agreement, except that in the current legal environment private contracts do not have the same legal standing as officially sanctioned marriage. Ilya Somin does a good job of critiquing Justice Thomas’s dissent here