President Barack Obama allows first grader Edwin Caleb to touch his hair during a classroom visit at Clarence Tinker Elementary School at MacDill Air Force Base in Tampa, Fla., Sept. 17, 2014.

President Barack Obama allows first grader Edwin Caleb to touch his hair during a classroom visit at Clarence Tinker Elementary School at MacDill Air Force Base in Tampa, Fla., Sept. 17, 2014.

President Barack Obama and Alyssa Mastromonaco, Deputy Chief of Staff for Operations, listen during a conversation with other members of the staff aboard Air Force One en route to Joint Base Andrews, Md., Sept. 9, 2012.

President Barack Obama and Alyssa Mastromonaco, Deputy Chief of Staff for Operations,  listen during a conversation with other members of the staff aboard Air Force One en route to Joint Base Andrews, Md., Sept. 9, 2012.

Choreographer Rosero McCoy teaches First Lady Michelle Obama and teen participants a dance during a Joining Forces event at the Jacksonville Naval Air Station in Jacksonville, Fla., April 12, 2012.

Choreographer Rosero McCoy teaches First Lady Michelle Obama and teen participants a dance during a Joining Forces event at the Jacksonville Naval Air Station in Jacksonville, Fla., April 12, 2012.

First Lady Michelle Obama and Dr. Jill Biden watch as NASCAR driver Carl Edwards points out features under the hood of his backup car before the start of the Ford 400 race at the Homestead-Miami Speedway in Homestead, Fla., Nov. 20, 2011.

First Lady Michelle Obama and Dr. Jill Biden watch as NASCAR driver Carl Edwards points out features under the hood of his backup car before the start of the Ford 400 race at the Homestead-Miami Speedway in Homestead, Fla., Nov. 20, 2011.

Vice President Joe Biden talks with Gen. David Petraeus, before dinner at the General’s home at U.S. Central Command in Tampa, Fla., June 29, 2010.

Vice President Joe Biden talks with Gen. David Petraeus, before dinner at the General's home at U.S. Central Command in Tampa, Fla., June 29, 2010.