LOL, Gizzi sometimes posts wrong information.
I’d like to know if it happened to a RAT President more recently than Morley.
“Obama sucks” by Reggie Love?
The one very clear example I can think of is Dick Morris publishing very vocal anti-Clinton books, but those books came out well after Clinton left office. I think he wrote them as a sort of "counter-point" rebuttal to Slick Willie and Hilderbeast's own bios.
If LBJ HADN'T died, I could imagine a slew of "disgruntled high ranking Johnson administration" officials would release "tell all" books about him.