Joe Biden, Barack Obama's running mate, has earned an 83 percent lifetime score from the League of Conservation Voters during his 35 years representing Delaware in the U.S. Senate, voting fairly consistently with environmentalists and the mainstream of his party. In 2007, while running for president, he said "energy security" was his top priority, and argued that he was well-suited to deal with the challenge thanks to years of experience on the Senate Foreign Relations Committee, which he now chairs. Biden is also a big booster of biofuels.
"I personally believe that the single most important step we can take to resume a leadership role in international climate-change efforts would be to make real progress toward a domestic emissions-reduction regime. For too long we have abdicated the responsibility to reduce our own emissions, the largest single source of the problem we face today. We have the world's largest economy, with the highest per-capita emissions. Rather than leading by example, we have retreated from international negotiations."
-- Jan. 30, 2007, in a statement given before the Senate Environment and Public Works Committee