Last night, I went to see "An Unreasonable Man," a new documentary about Ralph Nader. What, you might ask, does he have to do with Fast Company magazine? Quite a bit, actually. Nader's detractors pelt him with insults, some of his friends have distanced themselves, Democrats are still bitter, and even his admirers worry what will happen to his substantial consumer advocacy legacy. Midway through the movie, Fast Company's cofounder Bill Taylor pops up, discussing Nader's heyday.