A marcher holds an U.S. flag bearing the image of President Barack Obama during the 50th anniversary of the 1963 March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington

A marcher holds an U.S. flag bearing the image of President Barack Obama during the 50th anniversary of the 1963 March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington

A marcher holds an U.S. flag bearing the image of President Barack Obama during the 50th anniversary of the 1963 March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington August 24, 2013. Thousands of marchers were expected in Washington, D.C. on Saturday to commemorate the 50th anniversary of the Rev. Martin Luther King Jr.’s “I have a dream” speech and to urge action on jobs, voting rights and gun violence. REUTERS/Kevin Lamarque (UNITED STATES – Tags: POLITICS ANNIVERSARY CIVIL UNREST)