Winfrey, Whitaker to join March on Washington events

Oprah Winfrey, Jamie Foxx and Forest Whitaker are among the celebrities joining three presidents this week to mark the 50th anniversary of the March on Washington.

Soledad O'Brien and Hill Harper will host the "Let Freedom Ring" commemoration of Martin Luther King Jr.'s "I Have a Dream" speech. President Barack Obama and former presidents Bill Clinton and Jimmy Carter will serve as keynote speakers at the tribute.

Georgia Rep. John Lewis, who spoke at the 1963 March on Washington, will also speak at this year's march, along with Winfrey, Foxx and Whitaker.

Winfrey and Whitaker are starring in "Lee Daniels' The Butler,"a civil rights-era film about a man who served for seven presidents as a White House butler.

Musicians including LeAnn Rimes and BeBe Winans are scheduled to perform.

Open to the public, the "Let Freedom Ring" ceremony kicks off at 11:00 a.m. at the Lincoln Memorial on Wednesday.