Actor Michael J. Fox is set to attend President Bush’s State of the Union address next week as a guest of Rep. Jim Langevin of Rhode Island. Both men are loyal supporters of stem cell research and with good reason. Fox, 45, suffers from Parkinson’s disease, and Langevin has been confined to a wheelchair since he was a teenager. Before the elections last year, Fox appeared in several TV ads supporting the research. Alex P. Keaton would be proud.