You do understand that Michael J. Fox is a celebrity who is mostly out of the public's eye at this point, right? His few public appearances these days are very few carefully crafted (ironically like Hillary is becoming). You have no idea what happens when the mainstream media cameras are off (like Hillary, until someone from the public records it like the recent unconsciousness event). If he was in politics, would you want him to have the nuclear codes and getting 3AM phone calls?
I think I need to remind you about the last person with Parkinson's to hold a major political office. Do you remember
Janet Reno? Let's go down memory lane on what Janet Reno is remembered for.