No doubt the right is sexist and McCain's choice is a cynical one. That doesn't mean it's okay for the left to be. I'm reading posts calling into question Palin's ability to govern because she's breastfeeding, because she has a Down's syndrome child, because it's hypocritical for a conservative not to be an at-home mom, because she has too many kids, etc. I read an article suggesting that if Palin had a nanny, she's not a good enough woman candidate.

This kind of stuff is insulting to mother/women. It is sexist and should not be tolerated just because it's coming from the left. It's not falling for a right-wing trap to criticize something the left is doing all on its own. It is, however, to the advantage of the right wing to go on making the kind of comments that will turn off women because they will feel insulted. We saw that already in the Obama-Hilary race.