Description:At the vatican, where cardinals from all over the world are gathered, they've set a date - March 12 for the conclave to elect the next pope. The cardinals have had a busy past few days --- debating behind closed doors about issues facing the church and just who they want to lead their 1.2 billion members. Tuesday, after a Mass in St. Peter's Basilica, they'll vote by secret ballot in the Sistene Chapel.(1:20)