Not A Bad Idea, Actually
Arianna Huffington suggests Obama turn up the heat on McCain...on national security. She makes a convincing case. National security is the only area where McCain currently and consistently outpolls Obama, yet his pronouncements on the subject have been nothing but one long string of gaffes and misstatements (including most recently plagiarizing from Wikipedia and accusing Putin of wanting to restore the Czarist empire). The only reason McCain has gotten a pass is the MSM's man-crush on him. Obama should call McCain on it. It's a Rovian strategy, hitting your opponent where he's strongest. Maybe it can work for good instead of evil this time.
UPDATE: MSM continues to carry McCain's water on the Russo-Georgian conflict, even as it becomes more and more apparent that he has no idea what he's talking about.