Doonesbury by Garry Trudeau for October 27, 1972
Transcript:
B.D.: Boopsie, do you realize how much you're embarassing me by working for McGovern? Boopsie: I'm sorry. B.D., but I have to! I know you'll probably want to leave me but B.D., I remember once reading somewhere, "To thy own self be true." So be it with me. For now, adieu. B.D.: Pretty fancy language for a retired cheerleader!
And so Boopsie starts her career as the moral compass of the strip.