Source for Popular Vote data: Colorado Secretary of State. State of Colorado Abstract of Votes Cast at the Primary Election Held on the 10th day of September A.D., 1968 and at the General Election Held on the 5th day of November A.D., 1968, Colorado Secretary of State (http://www.sos.state.co.us/pubs/elections/Results/Abstract/pdf/1900-1999/1968AbstractBook.pdf) (accessed 7 Aug 2016)