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The role of the underdog in the presidential race is to change the terms of the debate. That's John Edwards on climate change policy. He was first out of the gate with a bold plan -- specific greenhouse gas reduction targets and an economy-wide cap-and-trade scheme. And the two front-runners followed suit with nearly identical plans of their own.

Last night during the Democratic presidential debate in Las Vegas Edwards called for an end to dirty coal. It's an area where Obama and Clinton have been conspicuously mum and/or wishy-washy.