What was the biggest landslide of the 20th Century

[bedstuy]

I think it's 1920, followed by 1964.  Each candidate reached over 60% despite losing the South.  Harding particularly lost the South by a significant margin, which was preordained for a Republican at that time.  So, to reach a total of 60%, he had to cleanup in the rest of the country.  Johnson had the same situation, but he did better outside the deep south.