Thanks to everyone who tried, and all those who mentioned Uncle Tom's Cabin are winners. The answer is A Key to Uncle Tom's Cabin. Uncle Tom's Cabin was published in 1852, and Harriet Beecher Stowe came out with A Key to Uncle Tom's Cabin in 1853. Blaine was being sly with this one. He did not include the name of the President's widow in his email; if he sends more information I shall post.