Here is an hour-long talk with John McKee Barr on “Civil War Talk Radio” with Gerry Prokopowicz. Mckee Barr is the author of Loathing Lincoln: An American Tradition from the Civil War to the Present.
It’s fascinating, although there’s not enough time at the end to deal with the modern Libertarian view of Lincoln. Even so, it’s well worth your time. The interview begins at minute mark 7:45.