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Rick Santorum, Newt Gingrich, Michele Bachmann, Mitt Romney, Rick Perry, Ron Paul, Herman Cain, Jon Huntsman

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Rick Santorum, Newt Gingrich, Michele Bachmann, Mitt Romney, Rick Perry, Ron Paul, Herman Cain, Jon Huntsman

Republican presidential candidates, from left, former Pennsylvania Sen. Rick Santorum, former House Speaker Newt Gingrich, Rep. Michele Bachmann, R-Minn., former Massachusetts Gov. Mitt Romney, Texas Gov. Rick Perry, Rep. Ron Paul, R-Texas, businessman Herman Cain and former Utah Gov. Jon Huntsman stand at the podium to answer questions during a debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Jae C. Hong)

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About the author: Alden Meyer has more than 30 years of experience on energy and climate policy. He is internationally recognized expert on U.S. and international climate policy. He also works extensively on renewable energy and electricity policy at the federal and state level. See Alden's full bio.

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