Source for Popular Vote data: Election Returns by Counties for the State of South Dakota - General Election - November 7, 1972. http://uselectionatlas.org/DOC/SD/GENERAL/SD_Official_Returns1972GE.pdf, Election Returns by Counties for the State of South Dakota - General Election - November 7, 1972 (http://uselectionatlas.org/DOC/SD/GENERAL/SD_Official_Returns1972GE.pdf) (accessed 18 Jul 2012)