My impression of Jeb Bush for a while now has been that a lot of people seem to think he's the smart(er) brother, but I've never seen any evidence to support their belief.
Whether or not he's the smart(er) brother, I think this book constitutes solid evidence that this is a man who has absolutely no intention of ever getting elected to national office.
ETA: Wow, I must be tired. There was a typo in the subject line. Geez.