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Drake University Hosts ABC News GOP Presidential Debate

DES MOINES, IA - DECEMBER 10: Texas Gov. Rick Perry (L) and former Massachusetts Gov. Mitt Romney speak during the ABC News GOP Presidential debate on the campus of Drake University on December 10, 2011 in Des Moines, Iowa. Rivals were expected to target front runner Gingrich in the debate hosted by ABC News, Yahoo News, WOI-TV, The Des Moines Register and the Iowa GOP. (Photo by Kevork Djansezian/Getty Images)

Great debate moments

By Claudine Zap

The first debate between Republican presidential candidate Mitt Romney and President Barack Obama will be held on Wednesday. While the candidates prepare their talking points, we look back at some of the more memorable moments from past presidential face-offs. A zippy zinger can get serious airplay even after the actual debate is over, but so can an ill-timed gaffe. Here, some of the top moments.