To follow up further - the Post columnist fundamentally mis-states what SCOTUS rules on. Any ruling by SCOTUS, even if it did invalidate DOMA, would leave state-level laws in place. It would not at one sweep invalidate all such laws. It might rule in such a way as to open challenges to such laws, but I find that particularly unlikely. Like 1000:1 against unlikely. This Court has been annoyingly activist when it feels like it, but its activism has been in overturning past Federal-level precedents, not in messing with the states.