Expand on that statement - I found it quite well researched and documented. You may also note that the author cites scholars supportive of Lincoln policies in the book. I'm curious have you read it?
I'll give a much more egregious example. I know from excerpts that Hillary! book is filled not just with errors but with outright lies.
For example: the college professor who graded a paper without reading the whole thing. The student had glued the last two pages together. He challenged the professor, who replied, "You don't have to eat the whole apple to know that it's rotten." LOL.
John / Billybob