“Winnie…the LBJ tag came from his campaign strategists. I still own political lapel buttons that read: “All the way with LBJ” “
Cool. Do you still wear them though?
My theory could still hold- his strategist may have felt it necessary to use LBJ to differentiate him from the previous Pres Johnson, and then they came up with the catchy line to rhyme with it.
There is something catchy and “large” about FDR, JFK, LBJ, but that may be just because I am so used them and their associations.