Defenders of traditional marriage have lost, alas. Rather than just sulk, I suggest that conservatives, especially those from Utah, respond by promoting legalization of polygamous marriage. This will put “progressives” in a lovely bind.
They will have a hard time opposing the idea because it is supported by the same arguments they used to support gay marriage. Why is love among threesomes any less valid than love of couples? Surely it’s past time for threesomes to come out of the shadows and break free of the yoke of suppression! End triophobia!
They will also have a hard time supporting it because almost all plural marriages, whether among Mormons in times past or in Islamic countries currently, feature one man with multiple wives. Clearly these are exploitative sexist unions! Most un-progressive!
Conservatives, don’t get mad, get even! Put it out there and watch ‘em squirm.