He believes in embryonic stem cell research and supports those candidates, who do as well. To show the horror of his disease he chose to be filmed wihtout the masking efforts of his medicine. This is just plain smart.
Furthermore, I have seen interviews and programs with Fox where he has to stop the event and take his medication because he is unable to stop his tremors.
Sorry - but Fox - a newly minted citizen - is out shilling for the Demos and using himself as a "human shield" because of his illness. How dare we criticize him - he is, after all, a walking saint.