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5. Sen. James M. Inhofe, R-Okla.
One of the most outspoken climate-change deniers in the Senate (he's renowned for calling global warming "the greatest hoax ever perpetrated on the American people"), Inhofe is also one of the most influential Republicans in the country when it comes to environmental policy. As ranking member of the Committee on Environment and Public Works, he uses his position to push for expanded oil drilling and reduce environmental regulation. Inhofe sometimes even finds himself to the right of the polluter-packed U.S. Chamber of Commerce; this summer he placed a hold on President Obama's nominee John Bryson as Commerce secretary, even though Bryson had the blessing of the Chamber, because Inhofe felt Bryson was too pro-environment.
March 21, 2007