I now think that the constant wrongness of Ann Coulter isn't an accident. She is an almost perfect example of a pure anti-rationalist: someone who will always and only believe things that accord with her ideology.

I'm very opposed to this kind of statement, because one of my core beliefs is that reasonable people can and will disagree on politics. This sounds too much like people calling Bush or Obama stupid when they disagree.

I suspect that you have a strongly opposing political ideology to Coulter's, and this is biasing you against her. I am aware of factual errors in some of her books, especially the ones about evolution, obviously. But assuming that you don't like Coulter and that you disagree with her values, I don't think you can objectively comment on her rationality.