Here's a hint:
When Harris was out giving speeches heavy on economic populism, polls consistently showed her in the lead.
When, at the behest of the donor class and their stooges in the DNC, she switched away from populism and to standard, vacuous neo-liberalism, that lead vanished, never to return.
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There's an important question though. Does the DNC actually want to win?
I honestly don't think they do. I think they've found a comfortable and profitable role as the controlled opposition, all of this hand-wringing is just for show, and what they're in fact going to do is just install another bunch of neo-liberal establishment hacks and go right back to their standard tactics of condemning the republicans while making excuses for failing to actually do anything about them, and promising that if only we give them more money, they'll surely stand up for us after the next election.
I'd love for them to prove me wrong. I would've loved that anyway, but it's especially significant now, because the US is circling the bowl, and the time for meaningfully promising anything is rapidly running out. This isn't just a moment when the DNC needs to step up to reclaim some integrity - they need to step up to do their part to save the US from the destruction the Trumpists are hellbent on bringing.
Will they?