I think it's just a chaotic system and, apart from extreme events, it's impossible to know what the actual reasons for most movements are.

There is a wing of the Democratic party which is definitely not a reflexive defender of corporate interests, but is unclear how much power it's going to have within the party.

But when enough voters are angry enough about something specific, then most politicians reveal that their #1 loyalty is to their own careers.

And besides, the AI billionaires failed to freely share their billions with the Democrats before this election. Can't let that kind of behavior go unpunished.