At this point, I am 100% sure Roberts was bought off. No way would they have hinged -this much- on a maybe vote.
The current theory for Roberts is:
1. Roberts is a thin skinned loser who is still crying over the bad press he got over Citizens United (which had him being declared history's greatest monster by folks like Keith Olberman, who outright compared him to the Supreme Court Justice who wrote the Dredd Scott Ruling which not only legalized slavery but nuked from orbit the political compromise put into place to keep slavery out of the northern states formed after 1820 and said he single handedly killed Democracy with that ruling). So since then, he's basically been cowed by the media into siding with the left in a desperate bid to bury that single decision in hopes no one mentions it when the history of the 21st Century is written.
2. Obama found out that Roberts and his wife didn't go through the legal channels for adoption and simply bought (via gray market adoption) his kids from their parents. Which is super illegal and that Obama and the Democrats have been blackmailing him ever since.
3. Roberts is tight with the Bush administration clique and has zero loyalty to Trump, so if he can make life hell for Trump from the bench, he'll do it.
That said, Roberts would be dead in a week if he ruled to hand the election to Biden. Hell, I wouldn't be shocked if the other conservative judges didn't kill him on the spot the second they realize he was betraying the GOP for good boy points.
She was the old, aging Democrat on the Supreme Court who hated Trump and loved Roe v Wade and wouldn't resign in order to spite Trump.
That's really all there was to Ginsburg in the public consciousness even before she died.
Ginsberg's transformation into a memestar is one of those things that happened with zero warning, as for YEARS she was a joke. The glasses wearing unfuckable ugly lady on the Supree Court, who's only pop culture relevance was on Family Guy, which did multiple jokes during the first couple of seasons (pre-cancellation) as a punchline due to her three word name and obscurity of no one giving a shit about her.
It wasn't until around 2014 that, overnight, the left and the media cronies on the left, suddenly declared that RBG was a huge rockstar and THE most famous member of the Supreme Court. It was utterly inorganic to the point that SOMETHING fishy was up that you had Rachel Maddow, SNL, Stephen Colbert, etc all treating RBG like she was the second coming of Jesus, with the manufactured "Notorious RBG" in particular being Milhouse level forced meme.
Some people have speculated that this was all Obama's doing. Obama wanted RBG to stay on the Supreme Court until Hillary took over and to get her to do so, Obama and the DNC called in countless favors from Harvey Weinstein and the media to, without any organic build-up, make Ruth a celebrity. Book deals, a god-awful bio film, celebrities fawning over her, mass merchandise featuring the Notorious RBG nickname, etc. All to make Ruth feel like the belle of the ball, feeding her ego and not retire.