Two chairs that will be used by U.S. President Barack Obama and Republican presidential nominee Mitt Romney sit empty during preparations for Tuesday’s presidential debate at Hofstra University in Hempstead, New York

Two chairs that will be used by U.S. President Barack Obama and Republican presidential nominee Mitt Romney sit empty during preparations for Tuesday’s presidential debate at Hofstra University in Hempstead, New York, October 15, 2012. REUTERS/Lucas Jackson