By a razor-thin margin last week, Costa Ricans approved their country's entry into the Central American Free Trade Agreement, which they've been told will bring all kinds of benefits to their economy. But nearly half of voters in that U.S.-friendly country viewed CAFTA as a bad idea. We've long supported free trade and hope that, with Costa Rica's approval, the pact will make commerce easier among the United States, El Salvador, Guatemala, Honduras, Nicaragua and the Dominican Republic. But the growing skepticism about free trade across the Americas, including in the U.S., suggests the results have fallen short of expectations....