Pope Benedict XVI is helped on to the altar by Bishop Guido Marini, right, during the Christmas Eve Mass in St. Peter's Basilica at the Vatican, Monday, Dec. 24, 2012. (AP Photo/Gregorio Borgia)

Associated Press
Pope Benedict XVI is helped on to the altar by Bishop Guido Marini, right, during the Christmas Eve Mass in St. Peter's Basilica at the Vatican, Monday, Dec. 24, 2012. (AP Photo/Gregorio Borgia)
Pope Benedict XVI is helped on to the altar by Bishop Guido Marini, right, during the Christmas Eve Mass in St. Peter's Basilica at the Vatican, Monday, Dec. 24, 2012. (AP Photo/Gregorio Borgia)
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