Fifty years ago today (Aug. 28), the nation was moved. To honor the 50th anniversary of Martin Luther King Jr.'s "I Have a Dream" speech, ABC News is live streaming a special commemoration from 11 a.m. E.T. to 3:30 p.m, with anchors George Stephanopoulos and Dan Kloeffler at the helm. Catch the live stream above, including coverage of President Obama's speech at the Lincoln Memorial, reports from Washington and historical commentary.