Check out some of the arguments for and against the 13th Amendment. I am sure it has some very interesting opinions on both sides of the aisle.
Google "Opposition to the 13th Amendment" and it brings up some interesting articles. I did not go all the way through them to see if there were any of the actual speeches involved, but you could get a list of key players and go from there.
Inside Every Bright Idea Is The 50% Probability Of A Disaster Waiting To Happen.