As nuclear negotiations in Vienna grind on through deadline after deadline, Iranian officials have begun a public campaign to blame the United States in the event that the talks fail. Iran ’s public diplomacy has long been geared toward selling a possible deal to hard-liners at home. But as an interim agreement between Iran and the West was extended on Friday to give negotiators more time, the government seemed to recognize the need to prove to ordinary Iranians that it had done all it could to obtain a final agreement and the lifting of economic sanctions. “Such people may ask those in charge of the negotiations, ‘Why have you not compromised more?’ ” said Farshad Ghorbanpour, an analyst who is close to the government of […]