I'm sorry, but what you are looking at is talking about MONEY. This isn't PORN or PROSTITUTION, which is what they are talking about. And they have to be interstate or international. If it all happens in 1 jourisdiction, it's a "local" matter.
Has there been any proof that anything physical happened?
Now Jim, you might be onto something with a sexual predator law, but with the age of consent being 16, it wouldn't apply. And those are state criminal codes.
ALL THIS ASIDE...
Foley is scum and should not be in congress. To pull ANYONE ELSE into this, is politics.