Final Freedom: The Civil War, the Abolition of Slavery, and the Thirteenth Amendment

There was a debate that the title book was the "true" main source for the film Lincoln, but regardless, it is a good political history of the ratification of the 13A.  It isn't a legal history of the amendment as such though provides a good reply to originalist (or at least some forms) interpretation regarding how the text was actually crafted and applied over time.