JFK apparently felt genuine sympathy for his 1960 presidential opponent Richard Nixon. He felt that, with Nixon's frequent shifts in political philosophy and reinventions, he must have to decide which Nixon he will be at each stop. This, Kennedy reasoned, must be exhausting.
David Pietrusza, 1960--LBJ vs. JFK vs. Nixon: The Epic Campaign That Forged Three Presidencies
consistency, integrity, leadership, maturation