Maine Sen. Susan Collins
There must be something in the water in Maine because the state's other Republican senator, Susan Collins, is also pretty hip to climate change and the environment at large. Collins beat Snowe by 9 percentage points with a perfect 100 percent score by the League of Conservation Voters (who endorsed her last year) and, in 2007, voted for a bill that would require the government to take global warming into account when planning projects. She's voted to preserve Corporate Average Fuel Economy, or CAFE, standards, to keep renewable and solar power funding, and to elevate the EPA to a Cabinet-level department.
Collins worked with Sen. Joe Lieberman to introduce the Collins-Lieberman Energy Independence, Clean Air and Climate Security Act which would have set new standards for transportation and energy and reduced emissions to 1990 levels by 2020. The League of Conservation Voters had great things to say when they endorsed Collins in 2008 and told Grist, "She has demonstrated great leadership, particularly on global warming. We think that she's going to play a critical role in 2009 in helping us get the 60 votes we're going to need to move something in the Senate."