Seldom has there been a larger contrast between the style of a candidate and the strategy of his campaign. Barack Obama is cool, firm and permanently unruffled. It is precisely this quality of steadiness that has made him seem a credible prospective president with the thinnest of résumés. But Obama's campaign is rootless, reactive and panicky. At every stage since securing the nomination, it has seemed fearful of missteps and unsure of its own organizing principle. So it has invariably adopted the Democratic conventional wisdom of the moment. Obama's first major decision was his running mate. He could have reinforced...