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Commemorate Martin Luther King Jr.'s legacy with #DreamDay

Martin Luther King Jr. waves from the steps of the Lincoln Memorial to supporters on the Mall in Washington during the "March on Washington" in 1963.

NBC News is asking all Americans to share their dreams as the nation celebrates the 50th anniversary of the March on Washington and Martin Luther King Jr.'s iconic "I Have a Dream" speech. Beginning today through Wednesday, everyone is invited to take part in #DreamDay by completing the statement "I have a dream that _________." NBC News is spotlighting the messages across its shows and digital platforms, sharing the dreams of the nation with millions.

The video, photo and text messages can be submitted to NBC News using Twitter, Facebook, Instagram and Vine, with the hashtag #DreamDay. A curated collection of the submissions will be featured on “TODAY” and “NBC Nightly News” with thousands of dreams spotlighted on NBCNews.com/DreamDay. NBC's owned and affiliate stations will also be asking local communities to share their dreams.

NBCNews.com/DreamDay launches today with contributions from Martin Luther King III, the Dalai Lama, the Rev. Jesse Jackson, N.J. Gov. Chris Christie, NBC News journalists Matt Lauer, Lester Holt, David Gregory, Al Roker, Natalie Morales, Chuck Todd, Kathie Lee Gifford, Hoda Kotb, Rehema Ellis, Erica Hill, and Ron Mott, among others. In addition, #DreamDay submissions will be featured around NBC's headquarters in New York City.

NBC News will dedicate special coverage in the days leading up to the anniversary, kicking off with “Meet the Press” on Sunday. The program will rebroadcast a rare interview with Martin Luther King, Jr. from 1963 — exactly 50 years ago and just days before the March on Washington. In addition, “Meet the Press” will focus the hour-long program on the theme of the “American Dream” featuring top political leaders telling personal stories unique to the American experience.