I disagree with the Jackson notion, also I'm fairly certain some states were winner take all like NY. I think Jackson is more likely to drop out with a liberal ideologue as the candidate like Sagan as opposed to when Dukakis ran. Also I think it's critical he drop out during the primaries to allow for Sagan to snowball in later primaries.
No, all the primaries on the Democratic side were done proportionally at this point with the cutoff at (15%).
I've been going through the Times articles of the period to get a better feel for what Jackson was during that time, and I still don't believe that he would have dropped out. While in many ways his platform would mesh with Sagan's, they would both be in favor of universal healthcare, public housing and public services like, presumably, education. Jackson would have held almost the entirety of the black vote, but most of the white voters who had not already supported him in 1984 might well have jumped ship to Sagan. I'm not sure what that would cost Jackson in terms of votes or delegates, but it would definitely hobble him outside the South.
Jackson however seems to have always had a problem of not being the "winner", or that he was deserving of a certain level of respect and responsibility, and this became a rather major problem historically when it complicated negotiations between the Dukakis and Jackson camps. When it became clear that he was not going earn the nomination he worked to push the Democratic platform to the left, sought to pressure Dukakis into naming him his running-mate, sought influential positions within the Dukakis campaign for his supporters, and wanted extensive influence within the Presidential campaign for himself, as in the foremost crusader for the ticket. Sagan might satisfy most of those demands, but I don't know if Jackson would try to wring the most he could here given he is in a better position negotiating with Sagan than he was negotiating with Dukakis. Tax increases on the wealthy for example was a major item that didn't quite make it, nixed by Mondale's experience in 1984, and he might make it a prerequisite here for his support.
I'm also not entirely convinced that Jesse Jackson would get through the Senate for the SOS position given opposition from Jews and his support for opening negotiations with the PLO.
But for now that's all an aside.
I do agree with you on the topic of Pat Robertson, I think James Dobson would've been an excellent choice, but as always it's up to OP if they want to retcon
Nothing against the idea of a more successful Robertson campaign, but I've seen more than a few stories on the site now that utilize him as if he had a better than decent chance of capturing the nomination or working his way onto the Republican ticket, which simply wasn't and never would have been the case given how polarizing he was even amongst the Republican base at the time.
I try not to retcon on the first go, but noted if I ever do a rewrite, thank you.
Your welcome; I like to nudge people in a more realistic direction with their stories, but that said I don't want that to get in the way of the story itself. I'm happy to see where it goes regardless.