The Democratic presidential candidates agree with Elton John: Saturday night's alright for fighting.

After a placid first debate, the second time Hillary Clinton faced primary challengers Bernie Sanders and Martin O'Malley, this time in Des Moines, Iowa, there were fireworks.

The early questions devoted to Friday's terrorist attacks in Paris were largely defined by Clinton's refusal to use the phrase "radical Islam" and Sanders' insistence that climate change was a bigger global threat than the Islamic State. "In fact," the Vermont socialist added, "climate change is directly related to the growth of terrorism."

But it also marked the strongest attack this year on Clinton's vote for the Iraq war, which Sanders linked to the rise of the Islamic State. O'Malley added that Libya and Syria were also "a mess," a fact that he attributed in part to some of Clinton's policies as secretary of state.

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