Marilyn Thompson, a 51-year-old investigative reporter and editor for The Washington Post, was named the editor of the Lexington Herald-Leader yesterday. In making the announcement, Publisher Timothy M. Kelly told newsroom staffers that he had fulfilled the promise he made in June to find an "extraordinary" editor for the newspaper. "I really do feel I have gotten the best editor I possibly can for this newspaper," Kelly said. Thompson's achievements at the Post include leading investigative teams that won two Pulitzer Prizes for public serv-ice. Last fall, she broke the story that South Carolina Sen. Strom Thurmond, once a leading...