Well, here's how he put it:
"Things are moving so fast in race relations, a Negro could be president in 40 years."
Then he continued, "There's no question about it. In the next 40 years a Negro can achieve the same position my brother has."
Of course, later that year, on June 5, as he claimed a presidential primary victory in California, RFK was assassinated.
He was preparing to travel to Chicago, home turf of Barack Obama, the "Negro" who would (volitional tense) be president in 2008.
R.I.P., both RFK and his assassinated brother, former President John K. Kennedy.