How much of LBJ's 1964 success was a result of JFK's assassination?

Basically what it says on the title.

JFK was shot and killed in November 1963, and LBJ won over Goldwater in a 486/52 landslide just under a year later. But what if Kennedy's health took a nosedive earlier in autumn '63 (he was a very sick man, after all), and by the time Nov 22nd rolls around, he's either resigned from office or dead already? Without the sense of national trauma that came from the assassination, and LBJ's resultant legislative successes such as the Civil Rights Act, is LBJ still able to win a term in his own right, and if so, is it still by as much of an overwhelming margin as OTL?

(For the purposes of this question, I'm assuming that butterflies push Lee Harvey Oswald out of the picture entirely and there's no equivalent assassination attempt on LBJ)
 
Basically what it says on the title.

JFK was shot and killed in November 1963, and LBJ won over Goldwater in a 486/52 landslide just under a year later. But what if Kennedy's health took a nosedive earlier in autumn '63 (he was a very sick man, after all), and by the time Nov 22nd rolls around, he's either resigned from office or dead already? Without the sense of national trauma that came from the assassination, and LBJ's resultant legislative successes such as the Civil Rights Act, is LBJ still able to win a term in his own right, and if so, is it still by as much of an overwhelming margin as OTL?

(For the purposes of this question, I'm assuming that butterflies push Lee Harvey Oswald out of the picture entirely and there's no equivalent assassination attempt on LBJ)

With the election less than a year after Kennedy's death, the majority of the country would still be united behind the new President and as in OTL Johnson's victory would be inevitable. IMO even a Bobby Baker scandal wouldn't be enough to sink LBJ. (Did Watergate sink Nixon?)

As for Johnson's domestic programs, they might be less popular it JFK dies of natural causes instead of murder. But LBJ could still take advantage of Kennedy's death to pass liberal programs as a tribute to the late President.

So Johnson wins, but perhaps by a smaller margin, and his domestic programs pass (but not as overwhelmingly).
 
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