The South often defied the Feds. Then their national guard got federalized by Eisenhower, or Johnson took away their right to run their own elections, or whatever. But those were federal legislative maneuvers (or at least they were allowed by existing legislation), and that's not what we're talking about I don't think.
If the Feds pass a law affecting a statie's interpretation of STATE law, which is what we're mulling here, I'd think the courts would schwack that down in very short order.
Point being , in theory although in recent times not in reality , states can not pass laws that violate rights guaranteed by the US constitution.
Like I said previously , " We're not saying blacks and women can't vote, we're just placing a few common sense restrictions on them being able to vote. "
Think that would fly?