For the first time in its history, Colombia has elected a leftist president. Gustavo Petro is a former guerrilla who became mayor of Bogota and then a senator. He defeated right-wing populist Rodolfo Hernández. As Nick Schifrin reports, his election overturns the center-right political establishment that has long run Colombia, and it could usher in a dramatic change with its U.S. relationship.

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