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He claims that Democratic machines in Chicago and Cleveland stole Illinois and Ohio, and that unnaturalized immigrants, especially Mexicans, illegally voted in California. (See http://psephos.adam-carr.net/countries/u/usa/pres/1948.txt for the extreme closeness of these three states, which would have given Dewey a majority in the Electoral College.)
(This is of course about 1948 and is in no way inspired by any recent events, so no discussion of contemporary politics, please!)