Al Gore's Nobel win has renewed speculation of an '08 run. At the same time, it has raised the question of what is the best platform for achieving real change. After all, Gore was awarded the Peace Prize not for things he did while holding the second highest office in the land, but for what he achieved while trudging around the globe as a slide-showing Jeremiah. Indeed, Gore has blossomed as a leader since leaving office. Conversely, we've seen the shrinking effect the seemingly endless process of running for president has -- turning candidates into overly-cautious pols less concerned with leading than with avoiding land mines. Which is why -- much as I would love to see Gore run -- it appears that his reply to the cries of "Run, Al, run" will be "Why?"