In a lifetime of teaching and leading priests in Latin America, which has the largest share of the world's Catholics, Bergoglio has shown a keen political sensibility as well as the kind of self-effacing humility that fellow cardinals value highly.
This Aug. 7, 2009 file photo shows Argentina's Cardinal Jorge Bergoglio, right, giving a mass outside San Cayetano church in Buenos Aires.
Credit: AP Photo/Natacha Pisarenko