Perhaps an apt metaphor for the framework agreement is a marriage engagement. The wedding is scheduled to take place at the end of June. The coming months will see vigorous debate about the size of the dowry and the terms of the prenuptial agreement. If past is precedent, the wedding date could well be postponed, and many parties — in Congress, Israel, the Arab world and Tehran — would like to sabotage it. If and when the wedding takes place, the success of the marriage will be assessed in the years to come. The bride doesn’t trust the groom. The groom doesn’t trust the bride. But for now the engagement should be celebrated. Based on the U.S. version of the agreement, it looks stronger than many anticipated. If the Iranians are working off the same document, it will be very difficult for critics of the agreement to argue they have a better alternative.