The Rev. Willie Peterson leads a prayer at the National Day of Prayer observance in front of the Nathaniel R. Jones Federal Building in downtown Youngstown. Evangelist Tracey Dawson, right, of Youngstown prays at the event. Below, one of the attendees holds a Bible during the observance. At the White House on Thursday, President Bush said that America's history is inexorably tied to prayer. "America is a nation of prayer. It's impossible to tell the story of our nation without telling the story of people who pray," he said. Bowing his head many times as Christian and Jewish leaders offered prayers, the president thanked those who pray for him, calling it the greatest gift a citizen can offer him.