@AC
While I may like your reasoning, the US Courts do not. They believe that the reporting done by the press outweigh the harm of the theft. Meaning that the greater good of informing the public outweighs the harm of the alleged theft, as long as the newspaper is not actively involved in the theft.
So unlike the recent issue of the newspapers actively committing a crime to obtain material for a story, just publishing stolen documents isn't a crime. Or rather viewed as a crime. There are precedences for this.
But you also raise an additional point. Unlike the traditional press which takes the purloined documents and then publishes them, Wikileaks 'sells' the information to the press acting more as a middle man in the theft. This would be an interesting take, however, they also dumped the documents for free on their website. It would be a bit of a push by the prosecution and you run the risk of setting a bad precedence if you lose.
Tie Wikileaks to the crime. Meaning they told Manning how to get the documents out of the US and in to their hands... then they are not a mere recipient of the documents but an active participant. Then you have Assange with his balls in a vice.
Assange knows this hence he's fighting any extradition. Also if he's charged and convicted, his movements and rights will be diminished.
The one thing I have to wonder about is mens rhea. That is if Assange does get tried on the rape charge, could he argue that he's innocent because of the absence of mens rhea? The because he's an Aussie male neanderthal, he lacked a 'guilty mind' because what he did wasn't rape under the laws of his country and therefore he didn't commit a crime?
I don't know how that would fly or even if its a legal/valid defense under Swedish law.
But lets see what happens.