President Obama And The First Lady Host "A Celebration Of Special Olympics And A Unified Generation"

Singer Katy Perry performs during a concert to mark the anniversary of the Special Olympics in the State Dining Room of the White House in Washington, D.C. on Thursday, July 31, 2014. Founded in 1968 by Eunice Kennedy Shriver, the Special Olympics movement has grown to more than 4.4 million athletes in 170 countries. UPI/Andrew Harrer/Pool