Actor and stem-cell research activist Michael J. Fox is getting involved in Maryland's Senate race - with a commercial endorsing Democrat Ben Cardin. The ad also criticizes Republican candidate Michael Steele's stance on stem cell research. Fox tells viewers - quote - "Stem cell research offers hope to millions of Americans with diseases like diabetes, Alzheimer's and Parkinson's. But George Bush and Michael Steele would put limits on the most promising stem cell research." Fox has also filmed 30-second spots for several other candidates. His publicist says Fox wants to get involved in races that involve candidates who disagree on...