What timing. On the day Gary Hart re-enters the Democratic presidential race, ABC News says it will have a segment about Lynn Armandt on its Friday night broadcast of "20/20." Armandt joined Hart, Donna Rice and William Broadhurst earlier this year on the yacht "Monkey Business" during a trip to Bimini. However, an ABC spokeswoman said Tuesday that Armandt declined a request for an interview. On June 18, Barbara Walters interviewed Rice on the program. Rice refused to say whether she and Hart had had an affair.