essly requires that the crime be committed "knowingly," and that requisite mental element applies as to each element of the crime. United States v. XCitement Video. Inc., 513 U.S. 64, 68-69 (1994); United States v. Meek, 366 F.3d 705, 718 (9th Cir. 2004); United States v. Root, 296 F.3d 1222, 1227 (11th Cir. 200