Re: A possibility
Maybe Mr Snowden has enough up his sleeve to drive a plea bargain - e.g. Let's all be nice about this and X, Y and Z won't see the light of day.
I'm not sure I wholly agree with Snowden leaking as he did, because I'm not suprised that the people we pay to spy on people also spy on us. However, I'd be amazed if he has anything left to divulge, certainly anything more revelatory, with which to plea bargain. I think he has far too much personal integrity for that, having done what he did because he thought it was right, and with certain knowledge of the personal sacrifice required.
I hope Snowden stays in Russia. I don't envisage any jury having sufficient open mindedness to take a view that he acted in americas interests, rather than going with the sterotypical 'patriot' routine and locking him away. I don't believe the state, if found to be innocent or if released from incarceration, could ever hope to keep him safe from 'patriots'.
If you believe that his actions were just, then you'll want him to stay away for his own safety. If you think he was wrong, well, then isn't exile punishment enough? He can never leave Russia - jailing him forever won't undo any damage the truth may have caused; it just feels like revenge.