The issue I'm concerned with is that this turns people like Manning into heroes.
Freedom of the press was not created to protect classified documents. They didn't exist at the time. It was created to protect the press' right to contradict and/or point out the flaw in the government system, and the people that manage it.
It's meant to prevent government censorship.
And legal or not, I'm just not comfortable with this level of freedom with national secrets. We'll see how it plays out over the long-term, but I don't think it's a fear of Assange you see, but fear of what these documents will do to strengthen our enemies.