WATCH LIVE: Barack and Michelle Obama open Obama Presidential Center with Springsteen, Stevie Wonder

President Barack Obama delivers remarks at Obama Presidential Center Grand Opening

Former President Barack Obama Gets Emotional Hearing a Letter From a 24-Year-Old Who Wrote Him at 7

David Letterman and Tom Hanks at Obama Presidential Center

Obama Talks Presidential Center, Iran, Political Divisions, More

Barack and Michelle Obama greet the first visitors of presidential center

Grand Opening Ceremony at the Obama Presidential Center