It's pretty obvious that GA was the most disappointing state for Rs last year, but which state was most disappointing for Ds? Texas? Florida? Ohio?
I'm not even sure about that. A Georgia and Arizona loss had obviously been apparent.
I think it hurt the GOP election strategists much more that they lost each of the three competitive blue-collar WWC states MI, PA and WI.
As for the Democrats: The correct answer is, obviously, North Carolina, as the Democrats had promised themselves a win there.
The runner-up is Florida, not because they would have built any false hopes up there, but because no Democratic campaign strategist had expected such a massive swing of the Cuban Americans in favor of Trump.