Do you think that this woman ever stopped to remember that voting for someone because of the color of his skin is the definition of racist? Or maybe she doesn't even know that it's racist?
You might be right that it meets some definition of "racist" (or even all definitions) but it ignores the motivation behind action. It's the same reason affirmative action is a sticky issue. I'm not choosing to weigh in on the issue since I see both sides and both sides have issues, but using race as a means of making decisions or analyzing problems to assist people shouldn't be cast into the same category as KKK members whose aim is to use race to destroy.