The Supreme Court, I lamented yesterday, routinely falls down on its job of protecting interstate commerce against state depredation unless Congress has (arguably, sort of) made the first move. Mercifully, though, the Court is very generous both in finding that Congress has made such a move and in spinning out what that move entails. Exhibit A is the Federal Arbitration Act, on deck in tomorrow’s argument in American Express C. v. Italian Colors Restaurant.