As a data analyst myself and a statistician
I can tell you one thing. if Trump win, you will see Trump popular vote is about the same or a bit less than what he got in 2020. But Harris will lose a big chunk of Popular vote if she loses. That's because of Harris losing the undecided centrist voter that come out strong in support for Biden back in 2020.
Trying to go after Trump, sure, that's okay, because you need to beat Trump to win the race, but the issue here is, this is more or less a self-inflicted gunshot wound, and the change of leadership so close to the race means you aren't going to pull the undecided back to your camp, because they know one thing, and you are giving them another.
They really should have dropped Biden back in November 2022, but then you know what happened (or rather what did not happen?) The Red Wave did not happen where it was supposed to, and they kept Biden, and independent can only tolerate a party only so far, and they did in 2022, not in 2024 if Dem loses it.