Tactically, it's smart. It breaks the Obama momentum, and takes the leadership initiative on the issue. But let's face it. It's a gimmick. McCain will debate, but he will come back, appearing to work for the country, and will change the format of the debate at the last minute to the economy instead of foreign policy, throwing a wrench in Obama's preparation for the debate. Plus, if they work something out, McCain gets credit, they don;t work something out, McCain will lambast Obama for not coming with him and making it work. It's cynical, dirty and politics at its best.