But it's increasingly difficult to believe that President Obama really thinks he can stop Tehran's quest for a bomb with diplomacy and sanctions. One gets vibrations from the administration that the game is changing--that the policy of engagement is for after Ali Khamenei gets his nuke. If this is so, the supreme leader will not reciprocate the kindness. He will just view it as weakness: The Islamic republic bested the United States, and the president has come groveling. Obama's diligent attempt not to meddle in Iran during the demonstrations earned him and America no kudos.