Article Photos: Mexico swears in president amid violent protests 27/54

Riot police take cover under their shileds as protestor throw stones over the steel security barriers around the National Congress, where the swearing in of new Mexican President Enrique Pena Nieto will take place in Mexico City, Sunday, Dec. 1, 2012.  Pena Nieto took power at midnight in a symbolic ceremony and will formally take the oath of office Saturday morning after campaigning as the face of a new PRI _ a party that claims to be repentant and reconstructed after voted out of the presidency in 2000.(AP Photo / Marco Ugarte)