50 years on, Martin Luther King Jr.'s legacy lives out loud

On April 4, 1968, the Rev. Martin Luther King Jr. -- in Memphis, Tennessee, to support striking sanitation workers -- was shot to death on a hotel balcony. What followed was a national reckoning and the greatest wave of social unrest since the Civil War. Fifty years later, Americans are honoring King’s sacrifice, in hopes of connecting his message to today’s struggles. Judy Woodruff reports.