JFK Assassinated in mid-January 1963

Let's assume that it happens (and that the assassin has no apparent foreign connections to complicate US relations with other countries). While in part my interest is in the possible differences between the JFK and LBJ administrations in January-November 1963, there would be important long-run effects even if there were no substantial differences in policy during those months. Since LBJ would take office before January 20, 1963, he will have served at least two years of JFK's presidential term, and therefore will not be eligible to run again in 1968. Of course in the end he decided not to in OTL, but what would be the effects of everyone *knowing in advance* that he couldn't run in 1968? RFK, it seems to me, would announce much earlier than in OTL, and Humphrey would find it harder to dodge the primaries.
 
Belated bump... (Note that the above post assumed that LBJ would still choose Humphrey as his running mate in 1964. Yet is it possible that if it were known in advance that the VP chosen in 1964 would be the likely front-runner for the 1968 Democratic presidential nomination, LBJ would have chosen someone else? I doubt it; I think it will still be HHH.)
 
Let's assume that it happens (and that the assassin has no apparent foreign connections to complicate US relations with other countries). While in part my interest is in the possible differences between the JFK and LBJ administrations in January-November 1963, there would be important long-run effects even if there were no substantial differences in policy during those months.
First of this is the best point for the assassination and the first few days:
On Tuesday, January 8, 1963, at the National Gallery of Art in Washington, D.C. along with 2,000 other guests of honor, President John F. Kennedy, views the exhibition of Leonardo da Vinci's Mona Lisa.
A night that would go down in history, as little after an hour into the evening, two shots run out as an assassin dress as a waiter shot the 35th President of the United States of America, rushed to
Vice president, Lyndon B. Johnson, has been on his ranch in Stonewall, Texas, spending the christmas holiday with Lady Bird, Lynda and Luci, when he received the call, that he was now head of state. On Tuesday, January 15, L. B. Johnson gives his first State of the Union address at a joint session of the U.S. Congress, as 36th President. His speech took notes from that of Kennedy's calling on Congress to pass legislation to lower income taxes as a means of stimulating the economy. The bill would become law on February 26.


Since LBJ would take office before January 20, 1963, he will have served at least two years of JFK's presidential term, and therefore will not be eligible to run again in 1968. Of course in the end he decided not to in OTL, but what would be the effects of everyone *knowing in advance* that he couldn't run in 1968? RFK, it seems to me, would announce much earlier than in OTL, and Humphrey would find it harder to dodge the primaries. (Note that the above post assumed that LBJ would still choose Humphrey as his running mate in 1964. Yet is it possible that if it were known in advance that the VP chosen in 1964 would be the likely front-runner for the 1968 Democratic presidential nomination, LBJ would have chosen someone else? I doubt it; I think it will still be HHH.)

What happens if Lyndon B. Johnson is assassination by Lee Harvey Oswald on November 22? 1964 is wide open. I would suspect these candidates to run in the primaries:
- Governor George Wallace of Alabama
- Governor Edmund "Pat" Brown of California
- Senator George Smathers of Florida
- Senator Hubert Humphrey of Minnesota
- Former Governor W. Averell Harriman of New York
 
Top