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Mexico's newly sworn-in President Enrique Pena Nieto acknowledges applause after delivering his inaugural speech at the National Palace in Mexico City, Saturday, Dec. 1, 2012. Protesters opposed to the new president clashed with tear gas-wielding police early Saturday morning outside the National Congress, where Pena Nieto took the oath of office. (AP Photo/Christian Palma)

Associated Press
Mexico's newly sworn-in President Enrique Pena Nieto acknowledges applause after delivering his inaugural speech at the National Palace in Mexico City, Saturday, Dec. 1, 2012.  Protesters opposed to the new president clashed with tear gas-wielding police early Saturday morning outside the National Congress, where Pena Nieto took the oath of office. (AP Photo/Christian Palma)
Mexico's newly sworn-in President Enrique Pena Nieto acknowledges applause after delivering his inaugural speech at the National Palace in Mexico City, Saturday, Dec. 1, 2012. Protesters opposed to the new president clashed with tear gas-wielding police early Saturday morning outside the National Congress, where Pena Nieto took the oath of office. (AP Photo/Christian Palma)
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