Source for Popular Vote data: North Dakota Secretary of State. OFFICIAL VOTES CAST AT THE GENERAL ELECTION HELD NOVEMBER 5,1968, North Dakota Secretary of State (https://vip.sos.nd.gov/pdfs/Abstracts%20by%20Year%5C1960s%27%20Election%20Results%5C1968%5CGeneral%20Election%2011-05-19) (accessed 26 Feb 2012)