Gustavo Petro, the presidential candidate, celebrates after winning the primary for the leftist Pacto Historico coalition in Bogotá on March 13. Photo: Raul Arboleda / AFP via Getty Images.

Gustavo Petro, the presidential candidate, celebrates after winning the primary for the leftist Pacto Historico coalition in Bogotá on March 13. Photo: Raul Arboleda / AFP via Getty Images.

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