The DNC doesn’t control state elections, the local democratic parties do. It is up to the state parties to run their primary (or caucus) as they choose. The DNC can influence primaries with spending, but they don’t make the rules for state-levrl primaries.
I think this is not the right conclusion to draw from Harris and Clinton lost to Trump. They were both right-center Dems with lots of anti-left positions. Clinton voted to attack Iraq even though we all knew there were no WMDs and had been a polarizing figure for decades, she was not a good candidate. Neither was Harris, she was corporate, didn’t condemn the genocide in Israel, and courted the Cheney vote. That isn’t how to get the left to turn out. Neither had a good platform. Mitt Romney lost and so did John McCain and John Kerry I don’t hear anyone condemning Mormons or veterans being losing classes of candidates.
A principled woman who isn’t a corporate shill or pro-genocide is completely different. Our system is broken, pretending a little adjusting of the regulations or pretending the other side is acting in good faith and being gracious is clearly a losing strategy.
At the presidential level, yes the DNC has been terrible with candidates. However they aren’t in charge of the other races. They can give money, but they can’t stop Socialists and other leftists running in primaries and winning them or general elections from school board to senator and everything in between. They can make it harder for these people to win, but they can’t stop or control city, county, or state elections. We need a base of elected officials pushing them to change their tack.
Not in Minnesota https://dfl.org/about/ the party is independent, I think it’s the same in other states. The way the DNC can influence elections in primaries is with endorsements and ad support.