Simply put, I think Charles Krauthammer is the best political commentator around. I don't agree with him all the time (on abortion, for example; he's pro-choice), but even when I don't, I recognize that he brings up points that need to be considered.
It's generally recognized that he is the Obama administration's prime critic; that is, the one of whom they need to be most careful. Between his penetrating analysis and his pungent, often tart, criticism, he is a very dangerous man for the left. And, as a licensed psychiatrist, when he says that a politician is suffering from paranoid delusions, he knows what he's talking about!
Here's his lecture yesterday at the Heritage Foundation, as he discusses Obama: the "first anniversary of the Second Coming."