JFK's death on 12/11/60 will have immediate ramifications RE: the 1960 Electoral College vote. Would all electors pledged to Kennedy, if instructed to do so by the DNC, vote for a dead man? Would all electors pledged to Kennedy, if instructed to do so by the DNC, vote for Johnson? How many more electoral votes might Harry Bird receive? Also, any elector voting Johnson for President
cannot also vote Johnson for VP. Might no one receive an electoral majority for President or VP in TTL? It would be sad, though historically interesting, to have LBJ inagurated as VP and then as POTUS on January 20.
Major civil rights legislation might be passed by Congress and signed into law by Johnson in 1963, though this depends on how the '62 congressional election unfolds. Johnson's Great Society proposals probably develop as per OTL, if he wins in '64.
Also, Congress would definitly adopt and send to the states for ratification a Presidential Succession and Disibility amendment (OTL XXV) in 1961. This might very well delay consideration of a Poll Tax Prohibition amendment (OTL XXIV). Additionally, I wonder whether the states would be so quick in TTL to ratify the D.C. Electoral Vote amendment (OTL XXIII) which was before them at the time?
For institutional memory, here's a link to a thread on this topic from last summer:
JFK Assassinated in 1960