[HandyDandy]

It was already effectively permanent. There was no way they could abolish it with a constitutional amendment. They couldn't have gotten enough votes to override it until some of the Southern states agreed to it. The Corwin Amendment would make it impossible to even bring it to a constitutional amendment.

The Corwin Ammendment was not directly concerned with it and its permanence or impermanence. The Corwin Ammendment had to do with putting the decision of a state being a Free State or a Slave State into the hands of each individual State. Ya know?...... like States Rights? You are arguing that no State in the South would ever willingly do away with Slavery.

[DiogenesLamp]

You can split hairs, but the bottom line is it further protected the institution of slavery, and Lincoln was urging it’s adoption.