Because Nixon successfully portrayed him as a scary socialist and the South figured he was the most friendly option, affirmative action or otherwise. Good that you bring that up, since it was the template for the Republican efforts in the South for the rest of the 20th Century and one of the key reasons why Nixon is considered one of the fathers of the Southern Strategy (that and sweeping the South for the first time apart from Goldwater's failed campaign). Plus CREEP's "dirty tricks"... you know, including fucking Watergate.
"My narrative" LOL, I'm literally just explaining history to you.
Because Nixon was impeached LOL.