In advocating reckless warmongering, the candidates posturing on Iran refused to acknowledge that Mr. Obama has been far more successful than his predecessor at persuading the international community to enact tougher sanctions in the United Nations Security Council and the European Union. Nor did they mention that while getting alarmingly closer, Iran does not yet have an actual weapon — reportedly, a computer worm that appears to have been worked on by Israel and the United States is believed to have been a significant setback. There is still time for diplomacy, including tighter sanctions.