Hillary Clinton

as are all of the various election laws that impact when people can register, closed or open primaries etc. While CA allows the political parties to decide if they will allow unaffiliated voters to vote in their primaries, that ability is granted to them by CA election law, not the DNC. That's why the R's had a closed primary and the D's had a semi-open one in 2016.

Effectively, many of Sanders' demands cannot be directly satisfied by the DNC, because of this. I have to believe that he knew that when he made them..

In a bipartisan effort, Minnesota's legislature did promptly vote in May to switch to a presidential primary in 2020, because the voters were ticked about an assortment of problems that had occurred with the 2016 caucus. But so far, they're the only state to change.