"Lopez was running far behind in the polls, and the Supreme Court's defiance of the decision by the Inter-American Court left a big cloud of uncertainty over Lopez's future, even if he were to come out ahead," said Cynthia Arnson, director of the Latin America program at the Woodrow Wilson International Center for Scholars in Washington. "Capriles has been the front-runner for some time, so the endorsement will continue to bolster his campaign."

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