Article Photos: Mexico swears in president amid violent protests 50/54

Mexico's newly sworn-in President Enrique Pena Nieto waves to the audience 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/Andres Leighton)