Feds obtain injunction against Arizona immigration law

A federal judge in Arizona has issued a preliminary injunction blocking key enforcement provisions of the new Arizona immigration law from taking effect until the legality of these provisions is fully litigated. The judge, Susan Bolton (a Clinton appointee), found that the Justice Department’s preemption argument is likely to prevail at trial.
I haven’t had time to analyze the opinion. Andy McCarthy has, and finds it unpersuasive .
It’s clear to me that the Arizona law doesn’t conflict or interfere with immigration legislation Congress has passed. If there is any interference or conflict, it is with the way the Obama administrtion wants to enforce such legislation — i.e., passively at best.
UPDATE: Heather Mac Donald provides a blistering critique of Judge Bolton’s ruling.