 Rosie O'Donnell was among O'Brien's most vocal and vehement supporters, calling Leno a "bully" and his actions "classless and kind of career-defining".Bill Zehme, the co-author of Leno's autobiography "Leading with My Chin", told the "Los Angeles Times", "The thing Leno should do is walk, period.He's got everything to lose in terms of public popularity by going back.