The Democratic candidates are arguing over the lingering effects of the North American Free Trade Agreement, particularly in Ohio. To discuss the role of NAFTA in the current election and look at its legacy are John R. "Rick" MacArthur, editor and publisher of Harper's Magazine, and Alberto Vourvoulias-Bush, editor of El Diario.

Plus, a perspective on free trade from Latin America. Costa Rica is the last country to have ratified a free trade agreement, passing the Central American Free Trade Agreement last October in a contentious and emotional vote. Gillian Gillers, political reporter for the English-language Tico Times, offers analysis.