BARACK OBAMA can deliver a brilliant speech tonight, but its impact could evaporate within days. John McCain and his allies have opened the 2008 Swift Boating season. Four years ago, a smear outfit called Swift Boat Veterans for Truth began trashing John Kerry's Vietnam War record. Kerry was never the same. Helter Skelter. What the GOP does is throw out so many attacks that the target and voters get confused and disoriented. This all-out Helter Skelter Republican attack machine is something Obama has never experienced. It always starts small. A small lie. First, they say he's like Paris Hilton. Then...