Neoconservatives recognize that a nuclear arsenal, in the face of few incentives to the contrary, is very much in the interests of Iran. While it certainly augments the conventional power of Iran, it more importantly appeals to intangible interests. For Iran, nuclear weapons are also a symbol of Shia-Persian predominance in the world of jihad. Fanatical or not, the mullahs of Iran understand that if they want to make their country a regional power that they must captivate the various jihadist audiences of the region and of the Muslim world to attain 'soft power.' This is also why Iran, along with Syria, which is suing for Lebanon to return to its rule, is disrupting U.S. efforts in Iraq. For the mullahs, there can be no competing narrative in the Muslim world such as democracy. Obama apparently fails to realize all this.
So neoconservatives should not be having wet dreams about Barack Obama. He may talk the talk, but he rarely walks the walk. And when he does, the tradeoffs he proposes are not worth the costs and run counter to any meaningful brand of neoconservatism.