Barack Obama: “This is a manmade catastrophe that's still evolving.”

And I will fight for that, even if I don’t always think it’s going to win.

I’m going to insist that we can do better than we’re doing right now.

The full weight of the federal government is being brought down on a law-abiding elected official because she has dared to criticize the president.

When we choose, when we make that decision, I do believe – and there is evidence for this – that the world gets incrementally better, and that is a worthy goal and it’s worth fighting for.