

There is a point at which the “best possible” is not sufficiently distinct from the worst possible that it becomes irrelevant for the individual in question. There was literally no benefit to Fetterman over Oz for most people. The only option was to work to make sure neither of them ever get another chance and to try to mitigate the harm that was going to be done when either one wins. I want to be clear, I don’t think this applies to the party as a whole but this is why (from the perspective of many) it does, because in their specific case the outcome is the same regardless. It’s a perfectly rational choice at the scale of the individual, because their interests, aren’t even on the ballot.

Is it? Because they still haven’t passed or blocked anything meaningful. It’s really easy to “Vote with the party” when you know they’re going to lose regardless. Your metric may be true, but it’s ultimately meaningless.