In retrospect, there was a ton of irresponsibility by the political press this cycle in how certain races were covered. But for my money, the PA Senate Race takes the cake.
When you get right down to it, the fundamentals really were never there for Oz, and the analysis throughout was buttressed by very little data. And it starts with the candidate himself - they spent a lot of time highlighting Fetterman's flaws (particularly after his stroke), but never considered that a candidate with 50+% disapproval numbers was gonna have an extremely difficult time beating a candidate with a positive approval rating.
It should cause introspection, but I'm sure it won't.