Felicity and Abigail Horan introduce Dr. Jill Biden at a Joining Forces event (October 3, 2012)

Felicity and Abigail Horan, whose father serves in the Army, introduce Dr. Jill Biden at a Joining Forces event celebrating the more than 100 colleges and universities that have signed on to “Operation Educate the Educators” at George Mason University in Fairfax, Va., Oct. 3, 2012. (Official White House Photo by David Lienemann)