A year ago, the prospect of a US-Iranian nuclear settlement seemed very distant. Now, top negotiators from Iran, the US and other major powers are convening in Geneva , and may be on the verge of concluding a deal this week over Iran’s nuclear programme. All signs point to a seriousness of purpose and a determination to get to an agreement. While the differences dividing Iran and the US are significant, the more difficult negotiations may well be the one each side faces at home. Most major international negotiations are, as Robert Putnam, the Harvard political scientist, put it, a two-level game; one set of negotiations take place at the table between the parties and another set back home among different domestic constituencies. The Iran nuclear negotiations are no different, and their success will depend as much on how domestic forces align within the US and Iran as on […]