I get what he's saying to a point.
There's little point at this moment of putting more laws into place on a national level becasue the ones we have aren't being enforced. Its one of those things if you "ground" your kid and he just ignores it and leaves the house anyways will "grounding" him again do any good if you don't stick to it any better than the initial time?
The federal government clearly doesn't have the will to be tough about immigration laws right now and enforcing the ones we have, so adding more laws nationally will do no good.
Where I disagree with him is with regards to Arizona. See, while you may say the country as a whole doesn't have a strong enough will for the laws to be enacted, I would say it'd be a VERY difficult argument to say those on the border states don't. Arizona adding a law on top of federal law IS different, because its not relying on the Fed's to enforce the law. They are actually taking matters into their own hands because the federal government has utterly and completely failed them at doing its job.
Its precisely the governments pathetic efforts at enforcing current existing law that is causing situations like in Arizona. The "law" isn't the problem, he's right, we have decent law (it could be better). Its the enforcing of it. We could have the greatest, most perfect immigration law ever....if the people who are supposed to enforce it don't then it'd be as meaningless as what we currently have.