These are the two great issues, the economic crisis and our safety. In the face of them, what strikes one is the weightlessness of the Obama administration, the jumping from issue to issue and venue to venue from day to day. Isaiah Berlin famously suggested a leader is a fox or a hedgehog. The fox knows many things but the hedgehog knows one big thing. In political leadership the hedgehog has certain significant advantages, focus and clarity of vision among them. Most presidents are one or the other. So far Mr. Obama seems neither.