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Packwood v. Senate Select Committee on Ethics , 510 U.S. 1319 ( 1994 )
Williams v. Zbaraz , 442 U.S. 1309 ( 1979 )
Nken v. Holder , 129 S. Ct. 1749 ( 2009 )
Hollingsworth v. Perry , 130 S. Ct. 705 ( 2010 )