. >> living with parkinson's disease-- a story frontline correspondent dave iverson and his family know firsthand. >> i hadn't thought that it would happen, but it has happened. >> parkinson's affects a milln americans. >> i have a mindset that i am going to... not let this blankety parkinson's get me down. >> and it's been front and center in the debate over embryonic stem cell science. >> this bill would support the taking of innocent human life, so i vetoed it. >> you know, when you're talking about the potential to heal and cure so many and it not going forward, it pissed me off and i wanted to do something. >> michael j. fox. >> now the politics have changed, but the quest for a cure continues. >> how close are we? we're a lot closer than we were ten years ago. a lot closer. >> tonight ofrontline, correspondent dave iverson tracks the pursuit of parkinson's and his own family journey. >> frontline is made possible by contributions to your pbs station from viewers like you. thank you. and by the corporation for public broadcasting. major funding is provided by the john d. and cather