Can you imagine the "swiftboating" manbearpig would get?
Don't count on that. There's a lot of otherwise normal sensible people out there whose eyes glaze over when you start to talk about GW or the environment in general. And Algore has a reservoir of credibility on this, even though it's not rational.
I have Algore as even money for the nomination, at this stage, fully expecting Obama and hillary to chew each other up in the meantime.