QUESTION: I noticed on your 2001 practice exam in the question about a federal voting  regulation where Congress was imposing a nationwide standard, that preemption  wasn't an issue. I'm having trouble seeing where it is or isn't an issue. Does  preemption only come into play in terms of commercial regulation rather than  something like voting?
ANSWER: No. Preemption has nothing to do with the particular subject matter at issue. It is relevant  when a party invokes state law, and the defendant claims that the state law is  invalid or inapplicable because it is preempted (it conflicts with a validly  enacted federal law). I'm not remembering exactly the facts of the hypo you  reference, but my guess is that no one was invoking a state law, thus preemption  was beside the point.