WASHINGTON — Some journalists who made careers out of questioning government officials and bearing witness to history may soon find themselves answering questions from prosecutors as key witnesses in the CIA leak case. Ten or more reporters from some of the most prominent news organizations could be called to testify in the perjury and obstruction case of former White House aide I. Lewis "Scooter" Libby. It's rare enough for reporters to become witnesses. But the Libby case is even more unusual because journalists will be dueling witnesses -- some called by the defense team, some by prosecutors. "It will be...