In all the time I've been a political junkie, I have never heard someone lie so consistently as John McCain. Everyday he says things that are not just distortions or enhanced interpretations but outright "white is black" lies about himself, about his running mate, and about his opponents. It's not just his ads. It happens in face to face interviews, too.
The lies are so consistent, and he lacks any nuance of chagrin or artifice when he makes them up and repeats them that I fear he, in fact, believes his own lies, just as Reagan, towards the end of his second term, could not distinguish between his movie roles and his real life.
I think McCain suffers from mental illness or deterioration--dementia, Alzheimer's disease, perhaps.
Or--let me be charitable--maybe, his military training which likely included how to respond if captured by the enemy has kicked in so that he can lie plausibly even while under duress.
At any rate, watching him on television say things that are outright lies--lies that have been exposed as such for days--is truly frightening. Even when it's pointed out to him that he's lying and he's confronted with the irrefutable evidence, he denies it. Add his awkward forced grin, and he looks mentally ill to me. If he's like this now, what will he be like in four years? As President?