Don't rule out Harris' internal polling just being bad and the public polling was superior. We're looking at a team whos message was "our opponent is a racist, homophobic, sexist, rapist, felonic avatar of Hitler" and then saw him gain margin which is quite remarkable. What did voters have to see in Harris' team for that to happen? They're clearly doing something wrong. If the team managed that I wouldn't assume their pollsters were a lone beacon of competence.
It seems quite plausible they hired bad pollsters and their internal data was off.
It seems quite plausible they hired bad pollsters and their internal data was off.