Pretzel Logic

As Donald Rumsfeld once famously said, there are known-knowns and known-unknowns, and then there’s Andrew Sullivan twisting himself into knots over his Burberry-clad bête noire:

The lies of Sarah Palin are different from any other politicians’. They are different because they assert things that are demonstrably, empirically untrue; and they are different because once they have been demonstrated to the entire world that they are untrue, Palin keeps repeating them as if they still were true or refuses to acknowledge that she was wrong.

As opposed to lies from politicians that assert things that are demonstrably, empirically true?