The Mormon church may have disavowed the polygamy it became so infamous for in the 19th century, but for some Fundamentalist Latter-Day Saints, "plural marriage" isn't just ancient history. Mormon bishop's wife Linda Wallheim couldn't be more surprised to learn that her son Kenneth is engaged. Kenneth has left the Mormon church, and met his fianc e, med student Naomi Carter, at a "Mormons Anonymous" meeting. Naomi was also raised Mormon--but...