Must be some archived footage that the Swamp has been hiding
https://www.snopes.com/fact-check/lbj-voting-democratic/
Sorry for Snopes link but even they say it is 'unproven'
>Did LBJ Say ‘I’ll Have Those Niggers Voting Democratic for 200 Years’
>President Lyndon B. Johnson supposedly made a crude racist remark about his party's voter base. There's little evidence to back it up.
The guy who smiled shortly after JFK was shot.