The stuff hosted by wikileaks is not illegal. A lot of people would like it to be, but it is not. There have been a number of articles yesterday going into this in great depth.
Ultimately 9 Justices in the Supreme Court determine that. If Gonzales v. Raich or Kelo v. City of New London are any indication I'm fairly sure they can come up with the legal gymnastics required to make these documents illegal given the current law.
