Article Photos: Mexico swears in president amid violent protests 47/54

Mexico's newly sworn-in President Enrique Pena Nieto delivers 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)