That remains to be seen. I am always open to newly discovered evidence.
Well you can start by reading the entire speech, especially the part where Lincoln spoke against slavery and the part where Lincoln said that the black man was entitled to the same rights guaranteed under the Declaration of Independence as a white man. Remember this was in response to Chief Justice Taney's Scott v. Sanford decision where he said that the black man, free or slave, was not entitled to any rights that a white man was bound to recognize. Lincoln was in total opposition to Taney and Douglas in that respect. Yet you place him below either man in terms of racism.