In exchange for raising money and investing in the DNC, Hillary would control the party’s finances, strategy, and all the money raised… This victory fund agreement, however, had been signed in August 2015, just four months after Hillary announced her candidacy and nearly a year before she officially had the nomination.

Emphasis mine. It was a captured field, with a performative primary - Hillary/‘s campaign abused their position against a broke DNC and elevated herself above all others.

This is why young people need to vote in every election especially the local ones, even the ones that seem insignificant like a school board election. The only way for a Bernie to win a primary is if such a candidate is not an outlier. The entire party needs to move to the left and that starts from the ground up. Since people need to get exposed to more left wing politicians so left wing ideology becomes more normalized and at the moment it's not.

When young people vote you get people like AOC and Omar into office. The only way to get a Bernie elected is if there are more AOCs and Omars filling seats in local, state and the federal government. From the school board all the way up to the Senate.