The James G. Blaine Mansion, commonly known as the Blaine Mansion, is an historic house located at 2000 Massachusetts Avenue NW, in the Dupont Circle neighborhood of Washington, D.C. The imposing house was completed in 1882 for James G. Blaine, a Republican politician from Maine who served as Speaker of the House, and later as a US Senator and US Secretary of State. He was also a presidential candidate who was narrowly defeated by Grover Cleveland in the 1884 United States presidential election.