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Mexico election: Peña Nieto powers forward, Lopez Obrador digs in his heels

Andres Manuel Lopez Obrador, announced the runner-up in Mexico's election, vows to challenge the results.

Mexican President-elect Enrique Peña Nieto, of the Institutional Revolutionary Party (PRI), speaks after a meeting with the foreign press in Mexico City on July 2, 2012.

Yuri Cortez

AFP/Getty Images

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