Doonesbury by Garry Trudeau for August 16, 1988
Man: Don't be fooled by Dukakis' self-serving disavowal of political labels! This man is a snarling, raving liberal! Woman: If it looks like a liberal, acts like a liberal, and spends like a liberal, the odds are pretty good that it's a liberal! Other man: Be forewarned, America! Michael Dukakis is now and always has been a card-carrying liberal! Booga! Booga! Booga! Mike: This is irresponsible! There are children still up at this hour!