The audience hooted and jeered at both Edwards and Obama as attacks continued -- when Obama accused Clinton of sounding like Republican candidate Mitt Romney and when Edwards repeated charges the front-runner took money from special interests. Watch CNN's Chris Lawrence separates debate facts and fiction Video
New Mexico Gov. Bill Richardson pleaded with his fellow debaters for a more civil atmosphere. See highlights from the debate »
"It seems that John wants to start a class war. It seems that Barack wants to start a generational war. It seems that Sen. Clinton, with all due respect on her plan on Iraq, doesn't end the war," Richardson said.
"All I want to do is give peace a chance," he said.
Some of the candidates further back in the pack also decried the wrangling between Clinton, Edwards and Obama.
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