Global trade growth is lackluster, so why all the controversy?

The global economy in which we all live and work has been blamed for a lot of things this election cycle. Too many factory jobs leaving the country and not enough of our domestic-made products doing the same. To hear the politicians tell it, trade is a terrible thing. Turns out, though, trade has problems of its own. Binyamin Appelbaum writes of them in the New York Times and spoke with Kai Ryssdal.