President Barack Obama pauses as he speaks at the screening of the film "Cesar Chavez," Wednesday, March 19, 2014, in the Old Executive Office Building on the White House complex in Washington. (AP Photo/Pablo Martinez Monsivais)
** FILE ** In this March 17, 2014, file photo, President Barack Obama speaks in the James Brady Press Briefing Room of the White House in Washington. (AP Photo/Susan Walsh, File)
** FILE ** In this March 17, 2014, file photo, President Barack Obama speaks in the James Brady Press Briefing Room of the White House in Washington. (AP Photo/Susan Walsh, File)
**FILE** In this photo released by the "The Ellen DeGeneres Show," Barack Obama dances with host Ellen DeGeneres before the show taping on Oct. 17, 2007. (Associated Press/Mike Rozman/Warner Bros.)