As the nuclear negotiations dragged into overtime here on Tuesday, some uniquely American and Iranian political sensitivities were permeating the marathon negotiating sessions, leading many to wonder whether two countries that have barely spoken for 35 years are just not ready to overcome old suspicions. In the hallway chatter overheard in the century-old Beau-Rivage Palace Hotel here, where Secretary of State John Kerry and his counterparts from five other countries are struggling to close a preliminary political deal with Iran , the Americans talk, in a wonderfully American way, about numbers and limits. Yet, when Iranian officials step out of the elegant, chandeliered rooms, where the post-World War I order was negotiated 90 years ago, to brief the news media […]