U.S. Vice President Joe Biden, right, and Italian Premier Mario Monti review the honor guard at Rome's Chigi palace Premier's office, Monday, March 18, 2013. Joe Biden led the U.S. delegation to newly elected Pope Francis' installation in Rome. (AP Photo/Alessandra Tarantino)

Photo by: Alessandra Tarantino

U.S. Vice President Joe Biden, right, and Italian Premier Mario Monti review the honor guard at Rome's Chigi palace Premier's office, Monday, March 18, 2013. Joe Biden led the U.S. delegation to newly elected Pope Francis' installation in Rome. (AP Photo/Alessandra Tarantino)