Vinod Khosla is a card-carrying Republican. But, the billionaire venture capitalist and alternative energy entrepreneur said, Democrat Barack Obama would be better for green businesses.

“I am a Republican, but I do believe Barack Obama will be a much bigger supporter of clean tech and renewable energy than John McCain will,” Khosla said at the Reuters Global Environment Summit in San Francisco. To see a video of the interview, click here.

Khosla stopped short of saying whom he would be casting a ballot for on November 4th, but added of McCain: “Unfortunately over the election cycle he’s gotten very beholden to some of the traditional energy interests. ”

Still, Khosla said renewable energy and climate change legislation was slowly garnering support from his party, too.

“A Democratic majority would be very good for renewable energy, but it is a bipartisan issue — there are many many Republicans who support it also,” Khosla said. “I think we are headed in the right direction. Maybe too slowly for my liking, but I think we are heading in the right direction.”

(Reporting by Ruben Ramirez)