WI: President X loses election 19XX to challenger Y?

"X" is a constant, correct? So the election year would have to be either 1900, 1944, or 1988. Then again, that means that the incumbent's last name would be either "Zero", "Four", or "Eight", which means we've got a PoD well before this hypothetical election as no OTL President had such a surname or even nickname, which means that it would probably not take place as butterflies would tear the USA into a million little pieces before

*headexplodes*
 
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