I think the real problem here is that Scalia is simply utterly wrong or totally dishonest. Of course the states can't control who is within their borders.
Then what do we do about the SC case that he cited that said otherwise?
Do you think that Pennsylvania is allowed to bar entry into it from citizens of New Jersey? (no matter how appealing that might be)
hee hee.
I don't think anyone honestly believes that to be the case. If the ability to control the entry and exit of individuals to your borders is the measure of sovereignty that Scalia wants to use then the answer is simple: the states are not sovereign, they never have been, and they never will be.
Well, if people don't believe it, I think it's more to do with the fact they can't imagine the necessity for it. But suppose a zombie apocalypse happened in NJ, and PA wanted to seal its borders against incoming zombies. Or a slightly more realistic example, suppose there were an actual outbreak of Ebola or something. I can see a case for states enforcing their borders.
Granted, it's not fair to compare immigrants to a deadly disease which clearly warrants extreme measures to curtail. But at least it's an example.
I think there aren't really many cases where the states exert significant sovereignty. As I alluded to before, I find it somewhat strange that in rulings released on the same day that Scalia speaks so stridently in favor of state sovereignty for Arizona and then tells another state that it cannot exert standards for conduct of the election of its leaders. That sounds like a pretty important element of sovereignty too.
It seems to me that if the states are sovereign at all it is in a very limited way. There's almost no aspect of governance that is immune from federal influence, at least in practice.
I guess you're referring to Montana's challenge to Citizen's United? I agree that is inconsistent. In defense, however, I'd hold that freedom of speech is a very clearly delegated federal responsibility, and not at the mercy of states to abridge. I assume that, or something akin to that, was their reasoning.
But consistency here would mean saying that states either have supreme power, or no power at all. That's where I get confused. I don't see how a case can be made for a middle ground if one is asked to be perfectly consistent.