133 cardinals from around the world will gather today in the Sistine Chapel for the papal conclave. The electors will vote on a new pope until there is a two-thirds majority. NBC News International Correspondent Molly Hunter reports more from the Vatican. Professor of American Studies and History at Notre Dame University Kathleen Sprows Cummings and Sam Sawyer, S.J., editor-in-chief for America Magazine, join Ana Cabrera to explain more on the centuries-old traditions.