Source for Popular Vote data: Wisconsin Secretary of State. Wisconsin Blue Book, 1940, Wisconsin Secretary of State (http://digicoll.library.wisc.edu/cgi-bin/WI/WI-idx?type=turn&id=WI.WIBlueBk1940&entity=WI.WIBlueBk1940.p0628&isize=XL) (accessed 18 May 2010)