Bradley effect/Shy Tory effect??
A sizeable amount of people tend to report to pollsters the more popular answer when polled which might of made LBJ looked better in the polls than in reality despite polling upwards of 70% at one point.
Goldwater actually polled far better in the Plains and the West then he actually preformed in the general election. Time magazine even predicted that Goldwater would win Wyoming, which he actually lost by about twelve points.
Georgia and Arizona should've been won.
I mean Georgia never voted GOP even once, they were straightly Democratic even right after the Civil War.
And the issue that made GA always vote Democratic made them flip sides in 1964.
Only by 9 points, a little more work in Atlanta and the "Black Belt" could easily have at least garnered a plurality.