Meaning the Friday, October 13, 2000 episode of the strip, linked to here.
I read Doonesbury every day and am familiar with all the characters, including Mike Doonesbury, his daughter Alex and his Vietnamese-American second wife, Kim.
I saw the kiss Al Gore planted on Tipper at the Democratic Convention.
But I don’t see why this strip is supposed to be funny. Is it just because Mike was married once before? That’s not enough, because Mike’s marriage to Kim has always been presented as much more stable than his previous one to J.J.
I believe Alex realized that she had felt reassured in the past when her mother and Mike Doonesbury kissed. Since he has remarried, obviously outward signs of affection toward another person don’t necessarily mean that their marriage is stable.