Campaigns usually collapse because of gaffes -- off-the-cuff actions that accidentally reveal the true nature of candidates. And the Barack Obama campaign has had more than its share of revealing gaffes: Obama's statement that rural voters turn to God, guns and racism because they have no jobs; his explanation that proper tire gauge use would fix high gas prices; his self-aggrandizing exhortation that he has "become a symbol of the possibility of America returning to our best traditions"; his associations with Jeremiah Wright and Bill Ayers and Tony Rezko; the list goes on and on. But gaffes are not the...