You very well may be right. BUT, I was listening to NPR last week when they interviewed Floyd Abrams. As you may be aware, Abrams is perhaps the preeminent authority on 1A issues - an unfailing champion of the First Amendment. He opines that Assange may be screwing himself here, and very well may have exposed himself to prosecution under The Espionage Act of 1917.
I'll try to find the audio. NPR keeps pretty good archives. If I can find it, I'll post it.