Tens of thousands of Christians, some huddled beneath blankets and umbrellas, gathered on the Mall in Washington, D.C. Friday for a day of prayer for their churches and their country. The Rev. Gerald Derstine of Bradenton, Fla., one of the first speakers at the "Washington for Jesus" rally, spoke of Christians repenting for the sins of the nation, like drug addiction, alcoholism and suicides. Derstine said. Organizers said the rally attracted people from all 50 states and from more than 100 countries. Members of many Christian denominations were present; most of those in attendance were evangelicals.