President Obama would be crazy not to dive deep into diplomacy with Iran, right now. Forget the standard throat-clearing bromides and water-testing toe-dips that mark the resumption of relations with suspect characters. When the world’s leaders meet at the U.N. General Assembly next week, Obama should not only shake hands with Iranian President Hassan Rouhani but also meet with him privately, hand him a list of a dozen issues to discuss (uranium enrichment, sanctions, regional stability, etc.), and even be prepared to announce, if possible, a time and place for negotiations to begin and a roster of the delegates to be invited.