Vice President Joseph R. Biden (left), followed by his daughter Ashley and son Beau, exit Air Force Two on Oct. 11, 2012, upon their arrival at Lexington Blue Grass Airport in Lexington, Ky., for the vice presidential debate. (Associated Press)

Photo by: Pablo Martinez Monsivais

Vice President Joseph R. Biden (left), followed by his daughter Ashley and son Beau, exit Air Force Two on Oct. 11, 2012, upon their arrival at Lexington Blue Grass Airport in Lexington, Ky., for the vice presidential debate. (Associated Press)