Article Photos: Mexico swears in president amid violent protests 42/54

Mexico's newly sworn-in President Enrique Pena Nieto acknowledges the applause of the crowd as he arrives at the National Palace to deliver his inaugural speech 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/Andres Leighton)