The South in 1968 in a two-way race between pro-civil rights candidates

[President Johnson]

How would the South have voted in 1968 if the presidential election was a binary choice between a pro-civil rights Democrat and a liberal Republican? Say the Democratic nominee is one of Lyndon Johnson, Hubert Humphrey or Robert Kennedy, while the Republican nominee is either Nelson Rockefeller or George Romney? Latter two did not have the appeal of Barry Goldwater to Southerners, who opposed the Civil Rights bill for non-racist reasons. But would Southern states, who went to Wallace and Nixon in 1968, vote for said Democrats? I think Lyndon Johnson would still stand the best chance as a Southerner, but the Deep South clearly rejected him four years earlier. Hubert and Bobby would likely have been unacceptable as well, though they would have won Texas (which Humphrey actually did).

Actually, I think a Dixiecrat candidate would have been inevitable that year unless Nixon with his Southern Strategy or one of Reagan/Goldwater is the Republican candidate, but I just wonder how these states would have gone if forced to choose between the names above.