People don't seem to get the origin of the Nobel Peace Prize, because all over the internet, you will read:
"How can they do that?"
They can do that because that was the intention of the prize....from the beginning. And it is THEIR prize. It is privately funded. They can do whatever they want. It was intended for visionaries, not necessarily an "accomplishment".
After all, peace starts as a belief. Having the vision for a nuclear free world is huge. It starts there. Did W have that commitment? did John McCain? No. Even Hilary Clinton didn't embrace peace as the ideal the way Obama did and does. So, it is rather special, in point of fact.