Lincoln auction at Sotheby's next Wednesday

[Eva Elisabeth]

My first thought would be he did because doing so meant much to him symbolically as it was the important subsequent step to the EP, about signing which he said: "I never, in my life, felt more certain that I was doing right, than I do in signing this paper." I guess he felt the same when signing the 13th Amendment.

Buchanan however had signed the "first" 13th Amendment, the Corwin Amendment, maybe Lincoln's signing was also intended a symbol against that.