** FILE ** President Barack Obama views a math project during a tour of Mooresville Middle School in Mooresville, N.C., Thursday, June 6, 2013. The president traveled to Mooresville, N.C., to promote his "Middle Class Jobs and Opportunity Tour." (AP Photo/Evan Vucci)

Photo by: Evan Vucci

** FILE ** President Barack Obama views a math project during a tour of Mooresville Middle School in Mooresville, N.C., Thursday, June 6, 2013. The president traveled to Mooresville, N.C., to promote his "Middle Class Jobs and Opportunity Tour." (AP Photo/Evan Vucci)