Can U.S. solve ‘Rubik’s Cube’ of Iran nuclear negotiations?

Aired: 10/15/2014 | 0:05:34 | Clip
With less than six weeks before the deadline to agree on an Iran nuclear deal, negotiations have come to a kind of stalemate over sharp limits on Iran's uranium enrichment capability. Gwen Ifill gets an update on the hurdles ahead, as well as areas of agreement, from chief foreign affairs correspondent Margaret Warner.