Thousands of marchers have returned to the Lincoln Memorial in Washington exactly 50 years after Martin Luther King Jr. delivered a speech which will forever remain in the American consciousness.

Among the speakers who gathered to remember that historic moment when King first said "I had a dream", America's first black President Barack Obama.

Al Jazeera's Tom Ackerman reports from Washington, DC.

For more on this story, click here: http://aje.me/15h1sEf