Comment by saghm

I'm not sure this is Goodhart's law, but I think you're right that the data doesn't really seem to support the claim, as well as with Nixon. My understanding is that the reason Nixon ended up resigning is that the Republicans in Congress told him that there would be enough votes to convict him after being impeached, so it didn't make much sense to stick around and get permanently stained as the only president ever to be forcibly removed from office after being impeached rather than leaving on his own terms and at least being able to claim innocence.