When it comes to women and political issues, conservatives will generally be the ones to attack women’s actions by attacking their appearance. Liberals, however, can be counted upon to respond by defending the woman’s appearance rather than her actions.
The corollary is, of course, that when desiring to promote a woman politically conservatives will trumpet the virtues of her appearance, whereupon at least some liberals will respond by attacking it.
I noticed that some responded to the Sensenbrenner comment about Michelle Obama's butt by arguing that it isn't big.
As for the generalizations, that seems about right.