A handful of legal ethics scholars and a national defense-lawyer group are now backing the Cook County public defender’s plea to the nation’s top court.The National Association of Criminal Defense Lawyers as well as academics from local law schools have filed amicus briefs at the U.S. Supreme Court, arguing Illinois courts were wrong to affirm Public Defender Amy P. Campanelli’s civil contempt charge after she declined to represent a woman in a murder case.Campanelli argued it was a conflict of interest …