Source for Popular Vote data: State of Wisconsin Legislative Reference Bureau. The State of Wisconsin Blue Book, 1971, State of Wisconsin Legislative Reference Bureau (http://digicoll.library.wisc.edu/cgi-bin/WI/WI-idx?type=article&did=WI.WIBlueBk1971.i0011&id=WI.WIBlueBk1971&) (accessed 7 September )