What is the argument behind the claim that:
State 'A' (or fed) must recognize (all) the
marriages of State 'B' ?
That's in the good ole Constitution.
Can't remember the reference, but I'll post it when I get home. It's kind of reasonable when you think abut it if we are a federal Republic, you can't have states going around trying to nullify the legislative acts of other states.
But that assumes that the states will act legally.
That's why the Constitution mandates the federal governemtn to guarantee to each state a "republican form of gevernment," i.e. non-tyrranical. I'd say that should extend to a ban on judicial tyrrany.
There is some cleaning up overdue in the federal judiciary as well as in the states. We need to get on this problem soon.
It's the "full faith & credit clause" of the U.S. Constitution.