Of course he is. Federal obscenity laws are not restricted just to child porn.
The 1st Amendment hasn't evolved as a "living document" in order to protect Max Hardcore. It is right there.
Sorry, but the first amendment has never protected obscenity.
You may want to email that link to various prosecuting attorneys as they seem to be having a hard time (no pun intended) on getting obscenity convictions against pornographers.
Certainly true but it seems the definition of "obscenity" has often caused prosecuters to throw up their hands in despair.