As Pope Francis visits the United States, Jeb Bush writes at CNN about his conversion to the Catholic faith 20 years ago. “In our Holy Father, we have a model of personal holiness and deep concern for the most vulnerable among us,” Bush writes. He adds, “The church has grounded me and my beliefs in a deep way of thinking about mercy, penance and the dignity and potential of every life, young and old, rich and poor, born and not yet born.