Colonel Key has been regarded by many as McClellan's evil genius, whose influence had been dominant in the general's political conduct and who was therefore the cause of his downfall. His influence on McClellan was unquestionably great,--and what he said to me is an important help in understanding the general's conduct and opinions. It accords with other statements of his which have been made public by Judge William M. Dickson of Cincinnati, who at one time was Colonel Key's partner in the practice of the law. [Footnote: I have failed in my efforts to find a communication on the subject in a newspaper, written by Judge Dickson, which he showed to me, reiterating his statements in it.] General McClellan urged me to come to his headquarters without ceremony, and after the battle of Antietam I had several opportunities of unrestrained discussion of affairs in which he seemed entirely frank in giving me his opinions. It was plainly evident that he was subjected to a good deal of pressure by opponents of the administration to make him commit himself to them. On the other hand, Governor Dennison of Ohio, who was his sincere friend, took every opportunity to counteract such influences and to promote a good understanding between him and Mr. Lincoln. McClellan perfectly knew my own position as an outspoken Republican who from the first had regarded the system of slavery as the stake ventured by the Secessionists on their success in the war, and who held to John Quincy Adams's doctrine that the war powers were adequate to destroy the institution which we could not constitutionally abolish otherwise. With me, the only question was when the ripe time had come for action, and I had looked forward to Mr. Lincoln's proclamation with some impatience at the delay.