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.<br /><br />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.<br /><br />Al Jazeera's Tom Ackerman reports from Washington, DC. <br /><br />For more on this story, click here: http://aje.me/15h1sEf
