WI: Nixon Dead/Incapacitated Before 1968

Imagine, for a moment, Richard M. Nixon, restless in his post-1960 retirement, abruptly dying before 1968. How would the Presidential Election of 1968 differ from our timeline if Nixon had either died or been incapacitated during his "wilderness years?" Furthermore, how would history have changed if Nixon was prematurely denied a second chance to redeem himself on the American political stage?
 
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