Money killed the Democratic Party. Without the money connection they probably would have gone with Biden or someone else without as good fundraising connections as Clinton but much less baggage and much more appeal to ordinary people.
On Trump’s Final Argument for America: “Corruption”
Lessig
22014

Was it primarily money that killed the Democratic Party or was Clinton ‘too big to fail’? She had successively built campaign apparatuses from 2000 to 2016 — each time increasing her influence within the Party. Unlike today’s Republicans, Democrats, especially in Congress, often rely on seniority to determine successors. Is that too many (or just enough) Democrats ‘respected’ Clinton, recognizing her status within the Party, to mount a challenge to her candidacy? The role of money cannot be understated yet it’s worth asking if the Party’s institutional deference inhibited challengers and thus fundraising.