Sober, dispassionate, and dead on:
Mention a name or theme -- Brett Favre, the Patriots under Belichick, Lance Armstrong's comeback, Venus and Serena -- and anyone who cares about sports can have a very sophisticated discussion about the ins and outs and myth and realities and arguments and rebuttals.
People who don't like sports can't do that. It's not so much that they can't identify the names -- they've heard of Armstrong -- but they've never bothered to follow the flow of debate. I like sports -- and politics and tech and other topics -- so I like joining these debates. On a wide range of other topics -- fashion, antique furniture, (gasp) the world of restaurants and fine dining, or (gasp^2) opera -- I have not been interested enough to learn anything I can add to the discussion. So I embarrass myself if I have to express a view.
What Sarah Palin revealed is that she has not been interested enough in world affairs to become minimally conversant with the issues. Many people in our great land might have difficulty defining the "Bush Doctrine" exactly. But not to recognize the name, as obviously was the case for Palin, indicates not a failure of last-minute cramming but a lack of attention to any foreign-policy discussion whatsoever in the last seven years.
Gibson used the word "preemptively" -- but if a knowledgeable person had pushed back on that point ("Well, preemption has was what John F. Kennedy had in mind in acting against the imminent threat of Soviet missiles in Cuba"), Gibson would certainly have come back to explain the novelty of the "preventive war" point. Because he knows the issue, a minor mis-choice of words wouldn't get in the way of his real intent.
Sarah Palin did not know this issue, or any part of it. The view she actually expressed -- an endorsement of "preemptive" action -- was fine on its own merits. But it is not the stated doctrine of the Bush Administration, it is not the policy her running mate has endorsed, and it is not the concept under which her own son is going off to Iraq.
How could she not know this? For the same reason I don't know anything about European football/soccer standings, trades, or intrigue. I am not interested enough. And she evidently has not been interested enough even to follow the news of foreign affairs during the Bush era.
People are claiming that the Bush Doctrine is vague and thus Palin may have been legitimately confused. I call bullshit. She looked like she had never heard of it, not like she was confused on a particular aspect.