From left, former President Jimmy Carter, former President Bill Clinton, former United Nations Ambassador Andrew Young, first lady Michelle Obama, and President Barack Obama stand for the national anthem during a ceremony commemorating the 50th anniversary of the March on Washington, Wednesday, Aug. 28,2013, at the Lincoln Memorial in Washington. The president was set to lead civil rights pioneers Wednesday in a ceremony for the 50th anniversary of the March on Washington, where Dr. Martin Luther King's