Ensuring That The Presumption Against Express Preemption Stays Dead

The plain text of the [preemption clause] begins and ends our analysis. Resolving [the question] for purposes of the pre-emption provision begins "with the language of the statute itself," and that "is also where the inquiry should end," for "the statute's language is plain." And because the statute "contains an express pre-emption clause," we do not invoke any presumption against pre-emption but instead "focus on the plain wording of the clause, which necessarily contains the best evidence of Congress' pre-emptive intent."