ving the federalization of activity that is wi in the States' historic police power, Congress must speak with particular clarity. See, e.g., Willi. Michigan Dept of State Police, 491 U.S. 58, 65 (1989). 12 08-80736-CV-MARRA RFP WPB 001681 EFTA00209860 KIRKLAND & ELLIS LLP Relevant Past Cases We have not been able to f