the media coverage of this has been unfair/stupid, imo. they claim he didn't know the name of a single foreign leader. however, the question was not name any foreign leader. it was fairly obvious to me, both in real time and in replays of the clip, that he was thinking of a specific person that he felt was at least adequate in the being admirable category but could not recall his name rather than casting about hopelessly for any name of any leader.
that happens to me about every five minutes, so i'm pretty sympathetic, but even if it didn't i would not conclude anything about his intelligence or ignorance based on forgetting fox's name.
i also think fox is a semi-decent name to pull out. wasn't terribly effective, but very charismatic and spearheaded the movement that ended the pri's nearly century-long grip on power in mexico.