As the presidential campaign heats up, Barack Obama has come out swinging against Hillary Clinton. In this Washington Post op-ed, Sebastian Mallaby writes that, alone among the Democratic candidates, Clinton has the honesty to insist that the case for war in Iraq was reasonable at the time - even if, with the benefit of hindsight, the invasion has proved disastrous. She is not running away from military power, even in a political climate that makes running attractive. Likewise on Iran, Clinton is the only one to insist that sanctions are less a prelude to war than a means of forestalling it. Mallaby claims that it is impressive and surprising that Clinton has risen above Bush hatred in forming her worldview.