Who is this person?

[David Lockmiller]

Six Months At The White House, page75:

"Mr. George Thompson, the English anti-slavery orator, delivered an address in the House of Representatives, to a large audience, April 6, 1864. Among the distinguished persons present was President Lincoln, who was greatly interested."

The following morning, Mr. Thompson and party, called at the White House. "The President was alone when their names were announced, with the exception of myself. (Francis Carpenter) Dropping all business, he ordered the party to be immediately admitted. Greeting them very cordially, the gentlemen took seats, and Mr. Thompson commenced conversation by referring to the condition of public sentiment in England in regard to the great conflict the nation was passing through."

Page 76:

Mr. Lincoln thereupon said: "Mr. Thompson, the people of Great Britain, and of other foreign governments, were in one great error in reference to this conflict. They seemed to think that, the moment I was President, I had the power to abolish slavery, forgetting that, before I could have any power whatever, I had to take the oath to support the Constitution of the United States, and execute the laws as I found them."