In "Politics and Social Science" it's #16, right after Dinesh D'Souza, well behind Blood Feud: The Clintons vs. the Obamas, but ahead of Ben Carson's two books.
Some of the books in the category are history and some are disguised self-help books, so for a political doorstop book, Hillary's isn't doing so bad.
Ominious for Hillary: the book hers is most often sold with according to Amazon, is Liz Warren's.
BTW, Strunk & White’s “The Elements of Style” which has been around over 40 years beats Hillary’s book at #97. Plus it is VERY useful. I found it an important reference book when I started writing a lot. I still recommend it.