I remember several years ago when a guy in Milpitas, CA had a computer bulletin board (this was 1991) and someone from Tennessee complained to the U.S. Postmaster about the porn (not child porn but just plain old porn). The guy was arrested and extradited to Tennessee where he was found guilty of distributing obsene material and was sentenced to prison. He also lost his appeal in 1996. The material was not considered obsene in CA but was in TN, so there is precedent for one state having different standards than another. I still don't think it is likely, but people rightly hate pedophiles so this guy could see some prison time.
Here is the prior case.