Source for Popular Vote data: North Dakota Secretary of State. North Dakota Official Abstract of Votes Cast at the General Election Held November 3, 1964, North Dakota Secretary of State (https://vip.sos.nd.gov/pdfs/Abstracts%20by%20Year%5C1960s'%20Election%20Results%5C1964%5CGeneral%20Election%2011-03-1964) (accessed 21 May 2016)