“Douglas would repeat what Lincoln said about racial equality at Charleston in debates to come, usually in support of his claim that Lincoln varied his remarks according to location. There was some truth to this, but far less truth to the ensuing charge of inconsistency. Douglas knew better, and by the time of the final debate, he had heard Lincoln’s explanation enough times. He simply chose not to accept it. He knew that when it came to Illinois voters, shifting the issue from slavery to race tilted the scales in his favor.”