It would certainly be challenged at the Supreme Court, so there would be a ruling at some point at that level. Whether or not the Court would affirm such a law, I don’t know. But, while highly unlikely every state would do this, it is not unprecedented that every state could enact the same or similar laws (the one that comes to mind is seat belt law, but New Hampshire is still a holdout, for some reason).
What if every state adopted a law barring felons from being eligible to be on the state ballot? I’m not American.
It would certainly be challenged at the Supreme Court, so there would be a ruling at some point at that level. Whether or not the Court would affirm such a law, I don’t know. But, while highly unlikely every state would do this, it is not unprecedented that every state could enact the same or similar laws (the one that comes to mind is seat belt law, but New Hampshire is still a holdout, for some reason).