VOICES--In 1986, CBS reporter Lesley Stahl went with her husband and daughter for a valedictory meeting with President Ronald Reagan before ending her stint as a White House correspondent. (She would later return to cover George H.W. Bush as well.) Before she went in, Stahl was told to ask no questions. When Reagan appeared, Stahl was faced with a befuddled man who did not seem to know where he was.