In a normal election, if there is such a thing, it ought to be clear by the end what the race is about--whether the candidates are promising continuity or change, bright contrasts or fine distinctions; whether it is about character or competence; whether the results will actually matter in most people's lives or just change the background music on the evening news while they go about multitasking and instant messaging and sorting the laundry and paying the bills.
But this election, this confoundingly close race, just dares wavering voters to make a decision and stick with it. It's even hard to...