Cardinal Angelo Sodano leads mass in St. Peter&#039;s Basilica at the Vatican March 12, 2013. All cardinals, including those over 80 who will not vote in the conclave, celebrate Mass in St Peter&#039;s Basilica to pray for the election of the new pope. The Mass is called &quot;Pro Eligendo Romano Pontefice&quot; (&quot;For the Election of the Roman Pontiff&quot;) and is open to the public. (Stefano Rellandini/Reuters)