It was the largest civil rights rally of its day. On August 28, 1963, an estimated 250,000 people participated in the March on Washington for Jobs and Freedom, coming in Washington, D.C. by aircraft, trains, autos, and buses from all across the country. The event is considered a turning point in the African-American struggle for equality with whites under the law. The name "March on Washington" came from a poem written by Langston Hughes entitled "We Shall Not Be Moved." The poem was adopted as the official theme song of the march. Hughes also wrote the lyrics to another popular song, called "I Have A Dream," which was sung by Nina Simone. The song has become a civil rights anthem. In addition to Hughes, other notables who contributed to the success of the march were Martin Luther King, Jr., Bayard Rustin, and Andrew Young. King delivered his famous "I Have A Dream" speech at the end of the march. He had been invited by President Lyndon B. Johnson to deliver the address at the Lincoln Memorial but declined the offer because he did not want to detract from the attention being given to the poor showing of black athletes at the time during the Mexico City Olympics. However, King later accepted an invitation to speak at the March on Washington. Rustin was chosen by King to be one of the main organizers of the march.