By inviting Barack Obama to deliver the commencement address and receive an honorary degree at Notre Dame, the Rev. John Jenkins has polarized the Catholic community nationwide – and raised a question. What does it mean to be a Catholic university in post-Christian America? Are there truths about faith and morality that are closed to debate at Notre Dame? Or is Notre Dame like London's Hyde Park, where all ideas and all advocates get a hearing? To Catholics, abortion is the killing of an unborn child, a premeditated breach of God's Commandment "Thou Shalt Not Kill." The case is closed...