Tell me you've never worked in US politics without telling me you've never worked in US politics, speedrun edition
I'll try to remember to explain the details to you when I'm not actively deplaning from a week-long work trip, because I'm not down with the "do your own research" attitude. But for real, if you have the opportunity to talk to someone who has actually dealt with state or federal election campaigning I encourage you to discuss the nuance of this with them.
In truth, politicians literally never stop campaigning. Every single decision they make until the moment they decide not to run for office again is colored by the need to get elected again. And even then, they are all thinking about how their actions are going to impact their colleagues and successors
When did I say anything about being "so singularly focused [...] that they are unable to enact policy"? They choose not to pursue the policy positions you want largely because it's politically expedient.
This right here is where you're not hearing me
What you define as "doing their jobs" and "doing the thing most effective at getting them re-elected" are not the same thing. That's literally the problem. Humans aren't as ethical, self-aware, intelligent, and future-thinking as you seem to want to believe.
Humans are, in fact, incredibly easy to manipulate, as it turns out.
Your idealism is noble but untempered by reality. Solving this particular problem will require something far different from simply abstaining from voting or whatever, and until you and others are ready for that, shitting on Harris and Biden for playing the rhetoric game when the alternative at the moment is a literal extreme fascist is not only a pointless endeavor but actually puts other people in harms way