One of the things about Bush that always struck me as being unique was his ability to pose credibly as both an insider and an outsider. He obviously had all of the advantages that came with being the son of a well-connected president, but his attitudes about his Ivy League education, and his fundamentalist religious views, communicated a degree of skepticism, and sometimes even contempt, towards the establishment. Reactionaries bought into this even if they didn’t like other parts of his program.
Similarly, Trump is the son of a very wealthy New York developer, but he clearly has a chip on his shoulder in spite of his privileged upbringing (presumably because his father didn’t do business in Manhattan), and his fans accept him as someone who can “drain the swamp” even though his few friends are all swamp creatures themselves. So maybe Bush wasn’t as unique as I thought, and maybe this is one of the secrets to success in the GOP.