The presidential debate

Republican challenger Mitt Romney and President Obama shake hands after their second debate.   (Mario Tama/Getty Images)

President Obama greets a crowd after his second debate with Mitt Romney, at Hofstra University in Hempstead, N.Y.   (STAN HONDA/AFP/Getty Images)

President Obama poses for a photo after his second debate with Mitt Romney, held at Hofstra University.   (Bruce Bennett/Getty Images)

Mitt Romney and President Obama gesture while arguing a point during their town hall debate at Hofstra University in Hempstead, N.Y.   (Spencer Platt/Getty Images)

President Obama addresses a question during his debate with Mitt Romney at Hofstra University in Hempstead, N.Y.   (Bruce Bennett/Getty Images)

President Obama and Republican presidential nominee Mitt Romney during the second presidential debate, held at Hofstra University in Hempstead, N.Y., and moderated by CNN’s Candy Crowley.   (Saul Loeb / AFP/Getty Images )

President Obama answers questions during the town hall-style debate at New York’s Hofstra University on Tuesday. During the second of three presidential debates, the candidates fielded questions from audience members on a wide variety of issues.   (Spencer Platt / Getty Images)

The stage is set for Republican presidential nominee Mitt Romney and President Obama to answer questions during a town hall-style debate Tuesday at Hofstra University in Hempstead, N.Y. During the second of three presidential debates, the candidates will field questions from audience members on a wide variety of issues.   (Bruce Bennett / Getty Images)

Protesters carry signs for various causes outside Hofstra University before the second presidential debate in Hempstead, N.Y. President Obama and Republican presidential nominee Mitt Romney will debate in a town hall-style meeting Tuesday evening at the university.   (Andrew Burton / Getty Images)

Protesters carry signs for various causes outside Hofstra University before the second presidential debate in Hempstead, N.Y. President Obama and Republican presidential nominee Mitt Romney will debate in a town hall- style meeting at the university.   (Andrew Burton / Getty Images)

Hofstra University junior Corinne Mestemacher poses with life-size images of President Obama and Republican presidential nominee and former Massachusetts Gov. Mitt Romney on campus ahead of Tuesday’s presidential debate.   (Mary Altaffer / Associated Press)

A woman shows her support for President Obama outside Hofstra University before the second presidential debate.   (Andrew Burton / Getty Images)

President Obama greets supporters on arrival at John F. Kennedy International Airport in New York City. Obama is headed to Hofstra University in Hempstead, N.Y., for the second presidential debate.   (Mandel Ngan / AFP/Getty Images)