Were there some people who made stupid and sexist attacks against Sarah Palin? Sure. The people who did so were wrong and should be rightfully condemned.
But you can't pretend that the knock on Sarah Palin was almost entirely substantive: i.e. she was woefully underqualified for the job of VP, and lacked even basic policy knowledge. That's not the kind of thing you hear lefties saying about Kay Bailey Hutchinson or Olympia Snowe, simply because both of these women are everything Sarah Palin is not: smart, serious, and accomplished.