Dean Purdom never lost confidence in his riding ability. He knew he had the skills. What he didn't have were the results. Purdom bounced all over the country, going from track to track until he wore out his welcome and headed to his next stop. The problem? He was trying to do the impossible, find success on the racetrack despite having an addiction to alcohol and cocaine. "I started back in the eighties," Purdom said. "I had a really promising career. I was the leading apprentice one meet at Pimlico....