Lead Iran negotiator is 'only hope'

Iranians look at newspapers displayed outside a kiosk on November 24, 2013 in the capital Tehran a day after a deal was reached on the country's nuclear programme.
Iranians look at newspapers displayed outside a kiosk on November 24, 2013 in the capital Tehran a day after a deal was reached on the country's nuclear programme.

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    Lead Iran negotiator is 'only hope'

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CNN's Christiane Amanpour speaks with New York Times Tehran Bureau Chief Thomas Erdbrink.