Shirley MacLaine in The Unsinkable Molly Brown?
According to a friend of director Chuck Walters: "His first choice for the lead role was Shirley MacLaine, but Debbie campaigned to unseat her. She and Chuck were buddies, so she played that card big time! Debbie even called Shirley directly to talk her out of accepting the role. Shirley had tons of other offers, so she graciously stepped aside. That made it possible for Debbie to play the role and garner her only nomination as Best Actress."