Actor Michael J. Fox has a series of political campaign ads circulating television networks in which he tries to persuade Americans to vote for Democrats who support embryonic stem cell research.

Fox, 45, suffers from Parkinson's, a chronic disease of the central nervous system, causing muscular tremors and physical weakness. Michael J. Fox is causing disputes in Missouri where in his attack ad he states, "Senator Jim Talent opposes expanding stem cell research. Senator Talent even wanted to criminalize the science that gives us a chance for hope."