That was a good documentary series. But I've also read that while McCarthy was willing to support Ted, he told EMK to his face that he would never have done the same for Bobby*. That killed whatever chance a McCarthy-Kennedy deal might have had.
*Seriously, what kind of cold-blooded jerk says that about another man's recently murdered brother?
Who knows if he would have or not. I think the problem is McCarthy let bad blood get too much into it and that lingered without any development as if it were still June 4th 1968 in late August of 1968. Were RFK to have lived, given further months of development in the contest (and how that would have been shaped into a transition of having to secure a nomination and what that relationship with McCarthy may have needed to become), and if the chips were really down to where it was RFK or Humphrey, who knows where McCarthy would have emotionally been. I don't know enough of McCarthy intimately to draw a psychological profile of him.