Source for Popular Vote data: Wisconsin Secretary of State. Wisconsin Blue Book, 1931, Wisconsin Secretary of State (http://digicoll.library.wisc.edu/cgi-bin/WI/WI-idx?type=turn&entity=WI.WIBlueBk1931.p0591&id=WI.WIBlueBk1931&isize=L) (accessed 28 May 2010)