The symptoms of Parkinson's disease that all but ended Michael J. Fox's acting career are making him a powerfully vulnerable campaign pitchman for five Democrats who support stem cell research.'In 30-second TV ads' for Rep. Benjamin L. Cardin, who is running for the Senate in Maryland, Senate candidate Claire McCaskill in Missouri and Wisconsin Gov. Jim Doyle, Fox shakes and rocks as he directly addresses the camera, making no effort to hide the effects of his disease.
In the McCaskill ad, which has been viewed by more than 1 million people on YouTube.com, Fox tells voters, "What you do in Missouri matters to millions of Americans. Americans like me."
Conservative radio commentator Rush Limbaugh claimed Fox was "either off his medication or acting," though he later apologized.
Dr. John Boockvar, a neurosurgeon and assistant professor at Weill Cornell Medical Center at New York's Presbyterian Hospital, called Limbaugh's claim "ludicrous." Boockvar said those with Parkinson's have "on" and "off" spells.
"If there is one single disease that has the highest potential for benefit from stem cell research," Boockvar said Tuesday, "it's Parkinson's."
















































