GOP presidential candidate Donald Trump will skip Thursday evening's Fox News debate amid a skirmish with the network over the inclusion of moderator Megyn Kelly. Rainier Ehrhardt/AP hide caption

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The Keith C. and Elaine Johnson Wold Performing Arts Center is the site off the upcoming presidential debate at Lynn University. The small Florida college is awaiting its big moment in the spotlight on Monday. Wilfredo Lee/AP hide caption

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Banners hang inside the media center amid preparations for tonight's presidential debate at Hofstra University in Hempstead, N.Y. Stan Honda/AFP/Getty Images hide caption

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President Obama speaks to supporters last month during a campaign stop in Las Vegas. Isaac Brekken/Getty Images hide caption

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In a 1988 debate against George H.W. Bush, Michael Dukakis's answer to a question about whether he would support the death penalty if his wife were raped and murdered is considered a huge stumble. LENNOX MCLENDON/ASSOCIATED PRESS hide caption

Ken Rudin collection

Hillary Clinton's "inevitability" became less certain after a debate in Philadelphia at Drexel University in October 2007. William Thomas Cain/Getty Images hide caption

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