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Haskin has a great book on him too that I suggest reading.
http://www.amazon.com/John-Henry-Tho.../dp/1581501501
A movie is being made for next year. Sounds very interesting. I believe they said the guy who originally sold him was devastated by his success and started using and drinking and once they retired him he was able to just quit the and drinking. Tons of interesting stories around this horse.