Bing Crosby and I play a lot of golf together and I have a small course at my place where we often play for side stakes. The only troulbe is that when I win, I always have to engage and attorney before I can draw the money.
In a democratic society, as Max Weber said, what is possible is only possible because some people have demanded the impossible. The abolitionists helped to create a public discourse in which men like Lincoln become possible. That doesn't mean Lincoln is an abolitionist. It means there is a public opinion out there which is being influenced by antislavery sentiment.