How did Southern Goldwater 1964 voters vote in 1968?

[Hydera]

What about the Southern Goldwater-Humphrey Counties:

5 in VA
16 in SC
1 in GA
2 in AL
8 in MS
3 in LA

Some of those can rather easily be explained by passage of the voting rights act shifting political majorities from white voters in power due to jim crow to black voters now able to vote due to the voting rights act of 1965, but some of these Counties have little to no black population in them. What happened there?

Jim Crow also prevented poor and illiterate whites from voting. Could poor and/or illiterate whites enfranchised by the Voting Rights Act have been a factor?

While most poor whites in the South didnt care. A lot of them did benefit from the Great Society programs.