United States v. Dhingra, 371 F.3d 557 (9th Cir. June 8, 2004) (18 U.S.C. 2422(b), using internet to solicit sexual activity from minor, held not facially unconstitutional as overbroad, vague, or violative of First or Tenth Amendments, for incorporating state criminal sex offense statutes).
http://caselaw.lp.findlaw.com/data2/circs/9th/0310001p.pdf