Stewart: What President Lincoln said in his Cooper Union speech was to point out the one thing southern slaveholders really wanted for the Union states.
"This and only this. cease to call slavery wrong, and join them in calling it right."
It was on this point that Lincoln said that the Union could not bend.
What Donald Trump wants is for us to stop calling his cruelty, fear and divisiveness wrong, but to join him in calling it right.
This we cannot do . . . and by not yielding, we will prevail.