"In 1968, Wallace had his slate of electors on the Democrtic line in Alabama and made Humphrey's electors run on some other line."
You are correct, in 1968 Wallace ran in Alabama on the Democrat ballot line and Humphrey ran on the "National Democratic Party" ballot line. But at least Humphrey managed to get on the ballot in Alabama that year. In 1964, Lyndon Johnson couldn't even get in the ballot in Alabama, and the two slates of electors in the state were Barry Goldwater's Republican Electors and a slate of "Unpledged Democratic Electors"; Goldwater carried the state with 69.45%.