Having a high IQ and having a near-photographic memory are not the same thing, and one is often found without the other. In extreme cases there are the absent-minded geniuses on one end, and the idiot-savants on the other.
As for Clinton, here's a fascinating article I first read when it came out in 1998, and have found it to be very illuminating in the years since: Can the President Think? .
It's a *long* read, but well worth it. At the risk of condensing it too far, it makes the case that Clinton has a superb (almost photographic) memory and a natural ability to charm people by sensing what they want to hear (and an emotional need to do so), but that he suffers from almost no ability to analyze information himself. He's just good at covering it and *looking* like his mind is going 100mph.
Sorry, I fumbled the link. Here's a working one: Can the President [Clinton] Think?".
If that ancient snapshot of a FreeRepublic post goes down, here's a link to an online copy of the original publication.
Thanks, I went to the piece and read it. (A good subtitle for the article would have been "The Attention Deficit Disorder President.") The Clinton it describes reminds me of myself in some ways (reading five books at once and finishing none of them).
When it comes to the Cl*nt*ns, though, it could be narcissistic personality disorder (Or it could be both