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"Have you stopped beating your wife?" is listed among logical fallacies, but the list is a grab-bag of different things.
Things like not proving a negative aren't logically impossible, but are onerous; the fallacy is in shifting the (relative) burden of proof.
"Have you stopped beating your wife?" is a question. It, therefore, has no truth value under some forms of semantics. So it's neutral, right? No. It has what's called an uncancellable presupposition. Presuppositions can be cancellable; assertions are cancellable with "yes" or "no".
Embedded in "have you stopped beating your wife?" is the affirmative answer. To parse the question, a step prior to answering it, you have to understand the positive sentnece "you have stopped beating your wife" and put a question 'operator' in front of it. Which means you have to entertain the truthfulness of it; in recall tests often the presupposition is retained in memory as true, even if it's false, esp. if the presupposition was introduced quickly and either no time was given for the listener to mentally deny it or the listener didn't bother to (perhaps because he didn't know it was false). In some languages you plop a question word in front of the positive sentence, sort of like "? you stopped beating your wife", if that helps: To understand and deny this kind of question, you and listeners have to accept the underlying positive form of the question. Semanticists used to hate this because it means we accept "The unicorns are extinct now" as implying there were mythical creatures, and truth-based semantics comes to a grinding halt.
Of course, "stop" strongly implies that there was previous on-going action. One does not stop what one is not doing. That is the underlying presupposition. It's what the addressee can't get to easily.
Now, the presupposition is non-cancellable, which simply means that it cannot be denied with a 'yes' or 'no'. "Have you stopped beating your wife?" "Yes" --> you *were* beating your wife. "No" --> you continue to beat your wife. You have to ignore the form of the question, which is yes/no, and address the presupposition: "I have never beat my wife." In so doing, you ignore the question.
The question immediately prior to McCain's answer had two parts. The first was implicit: Whether or not he snubbed some governor; the second was overt, forcing a yes/no answer to the uncancellable presupposition(s) that he was doing so because of the governor's low rating or because he was doing to him what he was doing to Bush, running away from him:
Maybe it's the governor's approval rating and you are running from him like you are from the president?)
(Chuckling) And I stopped beating my wife just a couple of weeks ago….
He had denied the snubbing several times. Now the same question is implied in a yes/no question presupposing the reasons for the snubbing. One has to presuppose that (a) McCain snubbed the governor--which is cancellable--(b) that it's because he's running away from the governor because of his low approval ratings, (c) that he's running away from Bush because of his low approval ratings. He denied (a); easy out--he's objecting to presupposition (a), being asked about it once again with a yes/no question. Less easy out: He's denying (b) or (c), non-cancellable in this form.
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