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On a quick read, the federal court's issuance of a temporary injunction against enforcement of the major provisions of the Arizona immigration law appears specious.

In essence, Judge Susan Bolton bought the Justice Department's preemption argument — i.e., the claim that the federal government has broad and exclusive authority to regulate immigration, and therefore that any state measure that is inconsistent with federal law is invalid. The Arizona law is completely consistent with federal law. The judge, however, twisted to concept of federal law into federal enforcement practices (or, as it happens, lack thereof). In effect, the court is saying...