[1] Despite not having run in a single primary, Humphrey was likely to get the nomination even if RFK had lived. It’s far from inevitable that Humphrey would have gotten the Democratic nomination, but given his support among the DNC, it’s likely:
https://en.wikipedia.org/wiki/1968_Democratic_National_Convention
[2] Robert Kennedy and Humphrey were actually on pretty good terms, despite Kennedy and Johnson’s mutual hatred.
[3] “Humphrey Taps Muskie Amid Demo Dissension”, St. Petersburg Times, Aug. 30, 1968:
https://news.google.com/newspapers?...AIBAJ&pg=5918,5839967&dq=eugene+mccarthy+1968
[4] With Kennedy still alive, Humphrey’s nomination will be less controversial than OTL, though I think some on the antiwar left will be disappointed. While protests are almost inevitable, I don’t think there will be the level of violence seen in OTL.