As he stood at the lectern last night, Bill Clinton was doing more than delivering another convention speech, something he has done every four years spanning four decades. This was a larger moment for the former president, and it was a long time coming. In this one speech, he was essentially making good on a marital and political promissory note by employing the full measure of his rhetorical skills to boost his wife's history-making week as the first woman to become a major party nominee.