FILE - This July 10, 2009 file photo shows President Barack Obama and first lady Michelle Obama meeting with Pope Benedict XVI, at the Vatican. Pope Benedict XVI said Monday, Feb. 11, 2013 he lacks the strength to fulfill his duties and on Feb. 28 will become the first pontiff in 600 years to resign. The announcement sets the stage for a conclave in March to elect a new leader for world's 1 billion Catholics. (AP Photo/Haraz N. Ghanbari, file)

Associated Press
FILE - This July 10, 2009 file photo shows President Barack Obama and first lady Michelle Obama meeting with Pope Benedict XVI, at the Vatican. Pope Benedict XVI said Monday, Feb. 11, 2013 he lacks the strength to fulfill his duties and on Feb. 28 will become the first pontiff in 600 years to resign. The announcement sets the stage for a conclave in March to elect a new leader for world's 1 billion Catholics. (AP Photo/Haraz N. Ghanbari, file)
FILE - This July 10, 2009 file photo shows President Barack Obama and first lady Michelle Obama meeting with Pope Benedict XVI, at the Vatican. Pope Benedict XVI said Monday, Feb. 11, 2013 he lacks the strength to fulfill his duties and on Feb. 28 will become the first pontiff in 600 years to resign. The announcement sets the stage for a conclave in March to elect a new leader for world's 1 billion Catholics. (AP Photo/Haraz N. Ghanbari, file)
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