In the vice presidential debate, Republicans thought Dick Cheney won and Democrats thought John Edwards won. I can understand both those judgments. In the first presidential debate, however you measured it, George W. Bush performed badly. But in the clash of veeps it was as if each contestant was playing his own game: One guy was playing a tennis match, the other football. If you thought you were watching the Super Bowl, the football guy was clearly the winner. If you thought you were at Wimbledon, the tennis guy was serving aces. One way to understand their isolation from each...