The Kid President: We all have a duty to keep dreaming

Robbie Novak, who plays the Kid President" in a series of popular YouTube videos, has spoken at Washington's Lincoln Memorial on the 50th anniversary of Martin Luther King's "I have a dream" speech.

He told the crowd: "I wasn't here 50 years ago...we all have a duty to make sure the world keeps dreaming for better things".

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50 years since King's dream

Tens of thousands of Americans have gathered at Washington's National Mall to commemorate 50 years since Martin Luther King made his I Have a Dream speech.