Both candidates will be seated at a table, like the vice presidential debate.
The debate starts at 9 p.m. EDT.
AP caption: "Lynn University students A.J. Mercincavage, stand-in for Republican presidential candidate former Massachusetts Gov. Mitt Romney, left, and Eric Gooden, stand-in for President Barack Obama, right, shake hands on stage during testing for Monday's presidential debate, Sunday, Oct. 21, 2012, at Lynn University in Boca Raton, Fla."