Is this sexism or something else?

I'm annoyed with what Ed Rendell said but am not sure what he said was sexist. Discriminatory against anyone who doesn't live a "normal" American family life, but not sexist. It would come as no surprise to me if I heard the same thing said about a man or a couple (like Joelle and I) that have no kids. In fact I've heard the same here in France regarding the Paris mayor (Bertrand Delanoë) as well as the mayor of Lyon a few years ago. Neither mayor is married and neither are women. It's no shock to hear similar remarks about couples who don't have kids. Sure, they can work more and are given less slack during difficult times since they have more time to devote to work, right? (I can think of many married men who invest very little time with their family, but that doesn't enter into the story as far as I hear.) There is an enormous double standard when it comes to couples without kids versus couples with kids, straight and gay, as many of us notice especially over the holidays.

I like Campbell Brown but here I think she's wrong. Rendell's comments could just as easily be made about many other people, men and women, married and single. It's not right, but it's also not sexism.