This combination of images shows, Republican presidential candidate Mitt Romney, left, and President Barack Obama, right, debating on Oct. 3, 2012, at the University of Denver. (credit: NICHOLAS KAMM/AFP/GettyImages)
Presidential Debate At University Of Denver
Republican presidential candidate Mitt Romney participates in the first presidential debate with US President Barack Obama at Magness Arena at the University of Denver in Denver, Colorado, Oct. 3, 2012. (credit: SAUL LOEB/AFP/GettyImages)
Presidential Debate At University Of Denver
President Barack Obama speaks during his debate with Republican Presidential candidate Mitt Romney at Magness Arena at the University of Denver in Denver, Colorado, Oct. 3, 2012. (credit: NICHOLAS KAMM/AFP/GettyImages)
Presidential Debate At University Of Denver
Democratic presidential candidate, President Barack Obama (R) speaks as Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens during the Presidential Debate at the University of Denver on Oct. 3, 2012. (Photo by Doug Pensinger/Getty Images)
Presidential Debate At University Of Denver
President Barack Obama (R) and Republican presidential candidate Mitt Romney wave to the audience on October 3, 2012 in Denver during the presidential debate at the University of Denver. (credit: SAUL LOEB/AFP/GettyImages)
Presidential Debate At University Of Denver
Monitors show the presidential debate in the Cable Center on the campus of the University of Denver. (credit: CBS)
President Debate At University Of Denver
University of Denver students watch the presidential debate on a big screen on DU's campus. (credit: CBS)
Presidential Debate At University Of Denver
Presidential Debate At University Of Denver
Republican presidential candidate, former Massachusetts Gov. Mitt Romney (L) speaks as U.S. President Barack Obama (R) listens during the Presidential Debate as Democratic presidential candidate, at the University of Denver on Oct. 3, 2012. (Photo by Rick Wilking-Pool/Getty Images)
Presidential Debate At University Of Denver
Republican presidential candidate, former Massachusetts Gov. Mitt Romney (L) speaks as President Barack Obama (R) listens during the Presidential Debate as Democratic presidential candidate, at the University of Denver on Oct. 3, 2012. (Photo by Rick Wilking-Pool/Getty Images)
Presidential Debate At University Of Denver
First Lady Michelle Obama arrives at the Presidential Debate at the University of Denver on Oct. 3, 2012. Sen. Michael Bennet is to her left. (Photo by Chip Somodevilla/Getty Images)
Presidential Debate At University Of Denver
Democratic presidential candidate, President Barack Obama (R) and Republican presidential candidate, former Massachusetts Gov. Mitt Romney (L) wave to the crowd prior to the start of the Presidential Debate at the University of Denver on Oct. 3, 2012. (Photo by Rick Wilking-Pool/Getty Images)
Presidential Debate At University Of Denver
First lady Michelle Obama (C) sits with White House Senior Advisor Valerie Jarrett (R) before the Presidential Debate at the University of Denver on Oct. 3, 2012. (Photo by Michael Reynolds-Pool/Getty Images)
Presidential Debate At University Of Denver
President Barack Obama (L) shakes hands with Republican presidential candidate and former Massachusetts Gov. Mitt Romney during the Presidential Debate at the University of Denver on Oct. 3, 2012. (Photo by Michael Reynolds-Pool/Getty Images)
Presidential Debate At University Of Denver
President Barack Obama (R) shakes hands with Republican presidential candidate Mitt Romney on Oct. 3, 2012. (credit: NICHOLAS KAMM/AFP/GettyImages)
Presidential Debate At University Of Denver
President Barack Obama shakes hands with Republican presidential candidate Mitt Romney on Oct. 3, 2012 in Denver. (credit: SAUL LOEB/AFP/GettyImages)
Presidential Debate At University Of Denver
Democratic presidential candidate, U.S. President Barack Obama (R) shakes hands with Republican presidential candidate, former Massachusetts Gov. Mitt Romney (L) during the Presidential Debate at the University of Denver on Oct. 3, 2012. (Photo by Chip Somodevilla/Getty Images)
Presidential Debate At University Of Denver
Presidential Debate At University Of Denver
(L-R) U.S. Secretary of the Interior Ken Salazar speaks with Colorado Gov. John Hickenlooper (R) prior to the Presidential Debate at the University of Denver on Oct. 3, 2012. (Photo by Chip Somodevilla/Getty Images)
Presidential Debate At University Of Denver
Gov. John Hickenlooper (R) hugs a debate spectator prior to the Presidential Debate at the University of Denver on October 3, 2012. (Photo by Chip Somodevilla/Getty Images)
Presidential Debate At University Of Denver
Republican presidential candidate Mitt Romney and his wife Ann watch their children and grandchildren playing a game before the start of the first presidential debate at the university of Denver on Oct. 3, 2012. (credit: JEWEL SAMAD/AFP/GettyImages)
Presidential Debate At University Of Denver
House Minority Leader Nancy Pelosi talks in the debate hall before the Presidential Debate at the University of Denver on October 3, 2012 in Denver, Colorado. (Photo by Justin Sullivan/Getty Images)
Presidential Debate At University Of Denver
Interior Secetary Ken Salazar watches preparation for the Presidential Debate at the University of Denver on October 3, 2012. (Photo by Justin Sullivan/Getty Images)