This section is from the book "The National Capitol. Its Architecture Art And History", by George C. Hazelton, Jr. Also available from Amazon: The National Capitol Its Architecture Art and History.
To the right and left of the picture of the Electoral Commission hang two remarkable mosaics, of Abraham Lincoln and James A. Garfield. They were made by Salviati, of Florence, Italy, and by him presented to the government after the deaths of its two martyred Presidents. On the walls of this room hang also portraits by Ingalls and Morrell, respectively, of Charles Sumner, Senator from Massachusetts, and of John Adams Dix of New York, who, when Secretary of the Treasury, on January 29, 1861, wrote the famous words: "If any one attempts to haul down the American flag, shoot him on the spot".