Enrique Pena Nieto, presidential candidate of the Revolutionary Institutional Party, or PRI, greets supporters after casting his vote in Atlacomulco, Mexico.
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Mexico election

Enrique Pena Nieto, presidential candidate of the Revolutionary Institutional Party, or PRI, greets supporters after casting his vote in Atlacomulco, Mexico.

Enrique Pena Nieto, presidential candidate of the Revolutionary Institutional Party, or PRI, greets supporters after casting his vote in Atlacomulco, Mexico. (Esteban Felix / Associated Press)

Presidential candidate Enrique Pena Nieto of the Institutional Revolutionary Party casts his vote with his wife, Angelica Rivero de Pena, in Atlacomulco, Mexico.

Presidential candidate Enrique Pena Nieto of the Institutional Revolutionary Party casts his vote with his wife, Angelica Rivero de Pena, in Atlacomulco, Mexico. (Daniel Aguilar / Getty Images)

Mexican President Felipe Calderon and his wife, Margarita Zavala, show their ink-stained thumbs after voting in Mexico City in the presidential election.

Mexican President Felipe Calderon and his wife, Margarita Zavala, show their ink-stained thumbs after voting in Mexico City in the presidential election.

 (Yuri Cortez / AFP / Getty Images)

An indigenous voter casts her ballot during the Mexican presidential elections in the town of San Juan in the state of Morelos.

An indigenous voter casts her ballot during the Mexican presidential elections in the town of San Juan in the state of Morelos. (John Moore / Getty Images)

Security forces patrol in a rural area close to the historic town of Tlaxcala, Mexico, on election day.

Security forces patrol in a rural area close to the historic town of Tlaxcala, Mexico, on election day. (J. Guadalupe Perez / AFP/Getty Images)

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