His campaign is more cultural than political. He sells himself more as a cultural breakthrough than as a candidate for office. To be a projection screen for the cultural aspirations of both blacks and whites one must be an invisible man politically. Real world politics, in their mundanity, interrupt cultural projections. And so Mr. Obama's political invisibility -- a charm that can only derive from a lack of deep political convictions -- may well serve his cultural appeal, but it also makes him something of a political mess.