Everything they found him guilty of essentially boils down to overstepping his rank and clearance within the military in terms of the information he possessed. Those are NOT political crimes; so now anyone with legal access to such information is encouraged to blow the whistle w/ out fear of being found guilty of treason or other overblown charges.
As for poor Bradley who will probably spend at least a few more years in prison - I hate to say it, but he should have planned this better. There's a colossal difference between activism and organized resistance, including where the person engaging in either ends up. Manning is an activist, whereas Snowden is an example of organized resistance. And they KNOW they'll NEVER catch Snowden - that's why they constantly make asses of themselves tantruming about him.