"Shepherd One" with Pope Benedict XVI aboard arrives at Andrews Air Force Base in Maryland, Tuesday, April 15, 2008. On the flight to the United States from Rome, Benedict addressed the most painful issue for the Roman Catholic Church in America -- clergy sex abuse. The U.S. church has paid out $2 billion in abuse costs since 1950, most of that in just the last six years.
Pope Benedict XVI waves upon his arrival at Andrews Air Force Base in Maryland, Tuesday, April 15, 2008. The pope arrived to a presidential handshake and enthusiastic cheering. It was a warm welcome that followed the pontiff's candid admission hours earlier that he is "deeply ashamed" of the clergy sex abuse scandal that has rocked the American church.
Pope Benedict XVI arrives at Andrews Air Force Base, Md., Tuesday, April 15, 2008, on his first visit to the U.S. as Pope. Benedict described his pilgrimage as a journey to meet a "great people and a great church." He spoke about the American model of religious values within a system of separation of church and state.
President Bush greets Pope Benedict XVI, Tuesday, April 15, 2008, upon his arrival at Andrews Air Force Base in Maryland. Mr. Bush made the unusual gesture of greeting Benedict at Andrews Air Force Base the first time he has welcomed a foreign leader there.
Pope Benedict XVI, right, is greeted by President Bush, center, first lady Laura Bush, second from the left and daughter Jenna Bush, at Andrews Air Force Base, Md., Tuesday, April 15, 2008. The pope is on a 6-day visit to the U.S.
President Bush escorts Pope Benedict XVI upon his arrival at Andrews Air Force Base in Maryland, Tuesday, April 15, 2008. A crowd of 9,000 or more is expected at the White House Wednesday to greet Benedict on his 81st birthday.
Pope Benedict XVI, left, walks with President Bush, right, during his arrival at Andrews Air Force Base, Md., Tuesday, April 15, 2008.
President Bush escorts Pope Benedict XVI, left, upon his arrival, Tuesday, April 15, 2008, at Andrews Air Force Base in Maryland.
Pope Benedict XVI, left, walks with, from second from left, Jenna Bush, President Bush and first lady Laura Bush, Tuesday, April 15, 2008, upon his arrival at Andrews Air Force Base in Maryland.
Pope Benedict XVI, left, walks with President Bush, center, and first lady Laura Bush, right, after his arrival to Andrews Air Force Base, Md., Tuesday, April 15, 2008.
President Bush escorts Pope Benedict XVI upon his arrival at Andrews Air Force Base in Maryland, Tuesday, April 15, 2008.
Spectators wave upon the arrival of Pope Benedict XVI, Tuesday, April 15, 2008, at Andrews Air Force Base in Maryland.
Pope Benedict XVI, right, walks with President Bush, left, after his arrival at Andrews Air Force Base, Md., Tuesday, April 15, 2008.
A U.S. and a Washington D.C. flag flank a Papal flag along Pennsylvania Avenue in front of the White House in Washington, Tuesday, April 15, 2008, in honor of the upcoming visit of Pope Benedict XVI.
Members of the Knights of Columbus, from left, Paul Lambert, Richard Head, Anthony Fortunato, and Charles Gallina, gather along Pennsylvania Ave. across from the White House in Washington, Tuesday, April, 15, 2008, The Knights of Columbus are the honor guards for Pope Benedict XVI who arrived Tuesday.