Out of curiousity, I did a google search on Oprah & childfree. I found an article that was posted here recently from "O Magazine" by Kim Catrall about her choice to be childfree. So Oprah is willing to bring attention to childfree issues.
I know that Oprah has always been open about saying that she's childfree by choice, but only when she's asked about her CF status. It's not like she's running around as the patron saint of the childfree. Perhaps, as others pointed out, this is because so many moms watch her show, or perhaps she's just more focused on other things - maybe she sees her CF status as just one small aspect of her interesting life.
I also found an article by a CF woman who mentioned a particular Oprah show about motherhood being difficult - apparently it set off quite a drama. Here is the
link. Below is the quote referring to that Oprah show:
"I saw an episode of Oprah Winfrey's show about motherhood being difficult, and several women came on to do a follow-up show, angry that Oprah had made motherhood look bad. When one guest was asked what was wrong with admitting that parenting wasn't always easy, the gal whined, "Some women out there might chose not to have children!" OH MY GOD. Call out the National Guard folks!!! The world is now over because some gal might not want children because she realized it wouldn't be easy."