The Swift Boating of Michael J. Fox John Nichols Sat Oct 28, 12:44 AM ET The Nation -- Rush Limbaugh is not just making an issue of Michael J. Fox's campaign ads for Democratic candidates who support stem-cell research. The conservative talk-radio personality is making it the issue of a fall campaign that gets stranger by the day. While it may be hard to figure out why anyone with Limbaugh's political pull and national prominence would declare war on the guy who played Alex P. Keaton -- one of television's most outspoken, if eccentric, conservatives -- in the series "Family...