Mexican President Enrique Pena Nieto, center, arrives with the President of the Democratic Revolution Party, Jesus Zambrano, right,  the President of the
Mexican President Enrique Pena Nieto, center, arrives with the President of the Democratic Revolution Party, Jesus Zambrano, right, the President of the National Action Party, Gustavo Madero, to sign the "Pact for Mexico", on December 2, 2012 in Mexico City. (ALFREDO ESTRELLA/AFP/Getty Images)