Plaw, I know exactly who you mean. She was rather prominently featured in a film about the presidency, perhaps Dave? Not sure of her name either.
As for President Bush, I think that as Northeasterners, we may have a problem with his style and cadence, as we did with Carter. We have a bias towards people who speak with a drawl, as we, consciously or unconsciously, consider them slow. Many Southerners think that Northerners are rude, even when they aren't, because of our rapid speech patterns.
However, in addition to that, he happens to be a terrible public speaker. President Clinton is a great speaker, and so is his wife.