Education experts faced off on the motion "Embrace the Common Core" at an Intelligence Squared U.S. debate, moderated by John Donvan (center). Samuel LaHoz/Intelligence Squared U.S. hide caption

itoggle caption Samuel LaHoz/Intelligence Squared U.S.

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

itoggle caption LENNOX MCLENDON/ASSOCIATED PRESS

Nevada Sen. Harry Reid (right) talks to his opponent, Republican Sharron Angle, as moderator Mitch Fox from PBS looks on after their political  debate at the Vegas PBS Studios in Las Vegas on Thursday. Mark Ralston/AFP/Getty Images hide caption

itoggle caption Mark Ralston/AFP/Getty Images