Obama adds a new wrinkle to his personal trade wars (was Austan Goolsbee right?). In an interview, "the presumptive Democratic nominee backed off his harshest attacks on the free trade agreement and indicated he didn't want to unilaterally reopen negotiations on NAFTA," Fortune's Nina Easton writes. " 'Sometimes during campaigns the rhetoric gets overheated and amplified,' he conceded, after I reminded him that he had called NAFTA 'devastating' and 'a big mistake.' "