Ralph Nader; It's Not Easy Being Green

Ralph Nader is making noises indicating another possible run for President in '08. He assails the Democrats for not being tough enough on corporations and for accepting money from basically the same corporate entities as the Republicans.
He is right about these and other issues. But does that mean he should run for President? A Nader candidacy would very likely have the same result as ocurred in 2000 when he cost enough votes from Al Gore to ensure the victory by G.W. Bush. Imagine if Nader had not run what the world might be like today!
Nader has no chance of winning, he can only be a spoiler, again!
Ralph should go back to being a tough consumer advocate. Why doesn't he go after SUV's?