I think that was the gist of it, and the '68 election was a big part of the motivation. Robert had started to break with LBJ on Vietnam a couple years before that, but didn't really publicly commit himself to an antiwar stance until about the time he entered the '68 campaign, after he saw that Eugene McCarthy seemed to have a shot running on an antiwar ticket.
Yes - exactly so.
Here's a timeline of 1968
http://www.nyu.edu/library/bobst/collections/exhibits/arch/1968/Index.html
You can almost make yourself believe that there was a concerted effort on the part of the USSR and their minions to change the world order in this year.
Tet Offensive
Paris Riots
Riots in US after MLK assasinated
Riots in Chicago during DNC convention
Invasion of Czecho
Various other SDS shenanigans
I lived through 1968 (although only 12 years old). I was aware of all these events but probably not their global significance. Truly they were "Interesting Times". Not good.