Yeah, I don't think it's fair to bring up her kids. And yes, I really do think that if she were a man with a 4 month old baby with Down's, we would not be bringing that up. Or at least it wouldn't be that big of a deal. Why? Because it would be assumed that his wife was the primary caretaker of the kids.
What if her husband is the primary caretaker of the kids? There's nothing wrong with that. As a new mom, I have the perspective that I would not want to be away from my baby, but I also have to consider that is not the case for every family and I can't judge them on that aspect. I'm sure it will come out in the media though and she'll be ripped up and down for it.
I too, am more concerned with her political viewpoints. I'm more excited that now this race seems exciting - really exciting. We've got history in the making either way and it's going to be a very interesting couple of months ahead. Oh, the drama!! :)