Lawrence Lader, a writer who so successfully marshaled his literary and political efforts in support of abortion rights that Betty Friedan, the feminist author, called him the father of the movement, died on Sunday at his home in Manhattan. He was 86. The cause was colon cancer, his wife, Joan Summers Lader, said. Mr. Lader was a major voice in the abortion debate for four decades, becoming a lightning rod for its critics as well as a beacon for its proponents. He wrote influential books and articles on the subject, organized ministers to refer women wanting abortions to doctors as...