Moor was appointed as a Democrat to the U.S. Senate to fill the vacancy caused by the death of John Fairfield. In later years he was the superintendent of a railroad construction project in Maine and was appointed by President James Buchanan as consul-general to British North America (i.e. Canada). After he left this position he retired from public life and relocated to Lynchburg, Virginia, where he had purchased an estate and became involved in an iron furnace operation and lived out his remaining years.
