Gore endorsing Obama for the Democratic nomination during the primary campaign.Standing on stage before a national TV audience at Mile High Stadium, Al Gore was a symbolic reminder of what could have been. He also delivered perhaps the best negativenarrative about McCain of the convention. “I believe in recycling, but recycling Bush’s policies is ridiculous,” Gore told the 70,000 strong crowd.Yet as I noted last week, what might be good for the convention and the Democratic party is probably not good for Gore’s tireless work to mobilize a diversity of Americans on climate change. Indeed, when it comes to his mission of waking Americans up to the global warming problem, Gore just sent the strongest signal to date that the issue can easily be re-interpreted through a partisan lens.