A vote for Nader is likely to be a vote for Bush, things being as close as they are. The consequences of this election are so meaningful and possibly live-or-death that I would consider it a wake-up call to anyone with two brain cells left to rub together, to get off their hobbyhorses and block the flood of encroaching fascistic measurements coming out of Washington.
One single life saved because we acted to get Kerry;'s brains in to replace Bush's gonads and "gut" is worth it. It isn't likely to be your life Guest, but it might be your brother's, or some teenaged girl full of hope trying to grow up in a small and rattled apartment in Fallujah. One vote, in this context, can have a ripple effect across the planet, reaching out and protecting that one child, or that one soldier, because a more intelligent hand was in command of American forces.