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I agree with Dusty Springfield's comment.
In the absence of "issues", perhaps this is EXACTLY what is needed. The campaign is reduced to personalities, celebrity capability, and great one liners! The very thing the McCain campaign was attacking prior to Palin.
The problem with this election is that people will be voting based on the psychological and not the factual. So, it does seem to me that, sexist or not, it is correct to address the psychological. It is all too screwed up so exposing it for what it is? perfectly acceptable and, perhaps, necessary. Her choice, to begin with, was sexist. They baited the public and the media to address sexist issues of motherhood, family, unwed pregnant daughters, pro choice, etc, by parading all of it in the public and then raging about the myriad of responses they should have expected they would receive.
Go for it!