 , the Midwest is home to several critical swing states that do not have a strong allegiance to either the Democratic or Republican party including Iowa and Ohio.Upper Midwestern states of Illinois, Michigan, Minnesota, and Wisconsin reliably voted Democratic in every presidential election from 1992 to 2012.The Great Plains states of North Dakota, South Dakota, Nebraska, and Kansas have voted for the Republican candidate in every presidential election since 1940, except for Democrat Lyndon B. Johnson in 1964.