When voters in South Carolina go to vote, did they listen to money, to their own hearts, or to "the establishment"? In any case, they did not listen to capital. And this is one way that politics is separated from capital.
There can never be perfect separation, all of society is connected to all of its parts in tricky ways, but part of maximizing that separation is to discover and acknowledge where capital has control of democracy and come up with ways to separate. No ideal is achievable, we can only strive to improve.
Uhm, that's very easy to say, but how is that even possible? Even here in Scandinavia, where money interests isn't as blatantly involved in politics as in the US, most of the media are aligned to corporate interests and vast amount of money are spend by corporations to fund and campaign for right-wing business parties and policies.
Why would Biden need money in competition with Sanders when he got the entire establishment on his side?