Trump's core support remains solid, but a significant minority of Republicans have soured

[xor]

9. Has there been much evidence to support they are actually compromising the voting machines?

I haven't seen much to suggest that's the case. I know there have been some attempts, but nothing I've seen says they had any great success. Isn't most of the Russian manipulations in spreading propaganda/lies in order to sway people to vote a certain way? If that assessment is accurate, then people turning against Trump makes it much harder for the to sway those same people to vote for him again. Although, I would think that just means they will focus on pushing other "preferred candidates"