Al Giordano summed it up well, I think. The America Obama describes in his speeches is almost a Platonic Ideal.
The best side of America appeared today in Cairo. And it feels like it has been so long since it has materialized that one’s windpipes must share the gasp of shock with the exhale of great relief. Is that really us? Oh my, it is. Or it still can be.But he can only point the way. It's up to us to do all the heavy lifting to make that Ideal into some kind of reality.