The most recent Scenes from a Multiverse (available on-line here) tackles the task of the U.S. Supreme Court:
The legal issues here are genuinely complex, but apparently SCOTUS isn’t contemplating undoing the same-sex marriages that have already happened as a result of judicial actions (as opposed to legislation or popular vote), though it could conceivably let stand existing bans in some states.
Then there’s the question of extending protections against discrimination based on sexuality to those jurisdictions that don’t now have them — or not.
And there’s more.
