Article Photos: Mexico swears in president amid violent protests 48/54

A seriously injured man is carried by demonstrators after he was hit with a tear gas canister shot by riot police during protests against new Mexican President Enrique Pena Nieto's rule, outside the National Congress, in Mexico City, Saturday, Dec. 1, 2012.   Pena Nieto took the oath of office as Mexico's new president on Saturday amid protests inside and outside the congressional chamber where he swore to protect the constitution and laws of the land. At least two protesters were injured, one gravely.(AP Photo/Marco Ugarte)