U.S. Rep. Joaquin Castro will share the stage with President Obama Wednesday to celebrate the 50th Anniversary of Dr. Martin Luther King Jr.'s "I Have a Dream" speech on the steps of the Lincoln Memorial.
President Obama will address the crowd on the same steps where Dr. King gave his historic speech in 1963 during the March on Washington.
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Presidents Bill Clinton and Jimmy Carter are also scheduled to speak. Castro will be the only Latino lawmaker who will address the crowd.
Oprah Winfrey, Jamie Foxx and Forest Whitaker are among the celebrities also taking part in the "Let Freedom Ring" commemoration.
Georgia Rep. John Lewis, who spoke at the 1963 March on Washington, will speak at this year's march, along with Winfrey, Foxx and Whitaker.
Winfrey and Whitaker are starring in "Lee Daniels' The Butler," a movie about a man who served for seven presidents as a White House butler.
Musicians including LeAnn Rimes and BeBe Winans are scheduled to perform.