An art installation of 857 empty school desks stands at the National Mall, near the Washington Monument, in Washington June 20, 2012. Each of the desks represents a U.S. student who drops out every hour of every school day, according to the College Board which set up the installation. A team of local college students, supporting the "Don't Forget Ed" national movement, collected signatures on site for a petition to be sent to U.S. presidential candidates asking them to prioritize education in the presidential campaign.