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The 1968 election was quite close. I believe that the popular margin was less than 1%.
I also believe that there was a potential scandal of Nixon's people discouraging South Vietnamese officials taking peace talks seriously.
Then too there is the fact that Johnson was not so well. Had Lyndon Johnson suffered a fatal heart attack that fall I suspect the sympathy shift would easily have been enough to put Humphrey in
WI Humphrey had taken the oath on January 20 1969.
Was there any outcome of Vietnam which did not look like a clear US defeat?
Could the Conservative reaction against "The Great Society" have been defeated?