What does the DNC have to do with the Confederacy or any of this? The DNC didn't exist then and today they are nothing more than a proponent of Marxism.
Alexander Stephens said nothing different from what Lincoln said. They were white supremacists of different stripes.
Cherry-picking quotes from one side doesn't prove the other side was any more morally superior or inferior.
Lincoln differed only from Stephens in that had the lawyer's ability to speak out of both sides of his mouth depending on the audience.
A private letter sent from Abraham Lincoln to Alexander Stephens-Vice President of the Confederacy. on Dec. 22, 1860.
For your own eye only
Hon. A. H. Stephens-
My dear Sir
Your obliging answer to my short note is just received, and for which please accept my thanks. I fully appreciate the present peril the country is in, and the weight of responsibility on me.
Do the people of the South really entertain fears that a Republican administration would, directly, or indirectly, interfere with their slaves, or with them, about their slaves? If they do, I wish to assure you, as once a friend, and still, I hope, not an enemy, that there is no cause for such fears.
The South would be in no more danger in this respect, than it was in the days of Washington. I suppose, however, this does not meet the case. You think slavery is right and ought to be extended; while we think it is wrong and ought to be restricted. That I suppose is the rub. It certainly is the only substantial difference between us.
Yours very truly
A. LINCOLN
So there you have it, the private Lincoln.
On one side, a portion of the white supremacist aristocratic slave owner class represented by Stephens which incidentally was present both in the South, and the North wanted to preserve the institution and not opposed to it being extended.
On the other side, a portion of the white supremacist Northern corporate class represented here by "Free Soiler" Lincoln only thought slavery should be restricted. The racist pole in the Union spine. Slavery was only wrong to them in that black folks would exist among them, something that many Republicans clearly said often publically and something they sincerely wanted to suppress, especially in the new territories, dreams of whitety NIMBY-land!
Northern Republicans did all they could to suppress free blacks up north too, Even in the land of Lincoln Illinois they made it illegal for free blacks to move there, and those that did live there were denied equal civil rights, including the right to vote. Jim Crow was born in the North.
Real abolitionists on the other hand disliked both sides.
https://www.libertarianism.org/columns/abraham-lincoln-abolitionists Actually, real abolitionists were in favor of the secession of slave states before the war.
https://www.libertarianism.org/columns/abolitionists-right-secession 
