A demonstrator throws a tear gas canister back to police during protests against new Mexican President Enrique Pena Nieto's rule, outside the National Congress, in Mexico City, Saturday

 

              A demonstrator throws a tear gas canister back to police during protests against new Mexican President Enrique Pena Nieto
A demonstrator throws a tear gas canister back to 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)