Happiest- I guess Florida. Yesterday morning, I thought I was being kind of ridiculous when I said there was an outside chance DeSantis could flip Palm Beach or Osceola. He flipped both. And, equally importantly, this landslide wasn't confined to DeSantis, as Rubio got similar numbers.
Saddest- The abortion referendums is the obvious answer. Kentucky stings especially badly because I felt like that was one we should have won. Ironically, that's the one that might not mean anything because it failing doesn't make the Constitution say that there IS a right to abortion in Kentucky.
Kentucky was a shock but with hindsight it made sense. Suburbanites are generally turned off by those type of measures and most WWC voting Reps are likely indifferent at best to the issue, particularly if they're not Catholic or evangelical. It still did strongly statewide despite those two things, I believe the measure won a majority of counties.