fed judge stops arizona immigration law

It's an issue of states' rights - very relevant in both cases. Your quote omits the relevant part of my post >

You obviously don't know the meaning of the term "actuarial deficit" - look it up, I'm not going to explain.

...modern America is a welfare state, even if our social safety net has more holes in it than it should — and low-skill immigrants threaten to unravel that safety net. [...] Unfortunately, low-skill immigrants don't pay enough taxes to cover the cost of the benefits they receive.

Worse yet, immigration penalizes governments that act humanely. Immigrants are a much more serious fiscal problem in California than in Texas, which treats the poor and unlucky harshly, regardless of where they were born..

But in a different domain - "illegal drugs" - the federal government has already told the states it will not interfere with enforcement, or lack thereof, by the states themselves.

...modern America is a welfare state, even if our social safety net has more holes in it than it should

.....So to the extent that the Feds delegate enforcement to the state, that's a federal policy, not a state right. ...

The police said Saturday’s attack was at least the 10th instance in the past four months in which assailants, mostly young black men, have assaulted Mexican immigrants walking in Port Richmond, which has seen the number of Mexican residents climb sharply over the past two decades.

The police say they are investigating the latest attack as a hate crime. They also treated the nine earlier cases as hate crimes, though in the three cases in which arrests have been made, grand jurors declined prosecutors’ requests to indict the suspects on hate-crime charges.

You do recall that any rights not specifically granted to the federal government or to the states belong to the people?

You obviously don't know the meaning of the term "actuarial deficit" - look it up, I'm not going to explain. And the burden of educating children of illegal aliens - not included in Medicare/Medicaid, but ordered by the federal courts - falls entirely on the states. So the North Carolina study you quote is irrelevant - even if its methodology were valid, which is very doubtful. Why don't you refer to Krugman's analysis instead? He covers the entire country, understands "actuarial" only too well - just happens to disagree with you, his party, and PC in general. He's right all the same.

And the political threat that low-skill immigration poses to the welfare state is more serious than the fiscal threat: the disastrous Medicare drug bill alone does far more to undermine the finances of our social insurance system than the whole burden of dealing with illegal immigrants.