Wisconsin (0.8%), Michigan (0.3-4%), and Pennsylvania (0.7-8%). 46 electoral votes. Additionally Florida went for Trump by 1.3%.
I mean, all of this is irrelevant to the results, but more what I was getting at is that its a plausible scenario for the Democrats to learn absolutely no lessons and bumble their way into a win in 2020, as it stands now. I don't think this is a good thing, but I'm arguing its an entirely possible thing.