Fred Thompson has an interesting (especially by the standards of other writings by politicians) article on federalism (hat tip: Instapundit). Particularly noteworthy is his critique of the overfederalization of criminal law:
Law enforcement in general is a matter on which Congress has been very active in recent years, not always to good effect and usually at the expense of state authority. When I served as a federal prosecutor, there were not all that many federal crimes, and most of those involved federal interests. Since the 1980