Best seller lists are not opinion polls. Why was it that when Rush Limbaugh's "The Way Things Ought to Be" fell out of the #1 position, the book that took its place was Howard Stern's autobiography? After weeks (or was it months?) of Limbaugh being at #1, did the American people all of a sudden turn boorish and crude? No, it's just that there truly aren't enough people who buy books to have one sector of the society dominate the book-buys. Limbaugh was #1; then Stern; then Buchanan was #3; a few weeks ago, Hillary was #1. It means nothing in terms of the overall attitudes and opinions of Americans.
I realize a bestseller list is not an opinion poll. But, if he didn't have a lot of support, his book wouldn't sell.