Why would I give you money unless I expected something in return? Do you think rich people give money away for free?
Yes, I understand you are a useless cynic and can't come up with a reason on your own.
If you look at the list of Harris's biggest donors, they are mostly lawyers. Maybe they gave the donations because they agree with Harris's positions? Also recall that Harris isn't running in a vaccum. The Republican she ran against was a total shithead. You cynics limit your thinking by always believing conspiracy and skulduggery explain everything.
So, regardless of your belief, lets look for proof. Has Harris taken advantage of her position financially or is she coddling some venal industry that has given her tons of money? In another state, did Manchin support coal because of large donations or did coal donate to him because he was pro-coal? Same with Ojeda, aka Manchin 2.0. Did he support coal miners because he was given money by coal unions or did he support coal unions and so they gave large donations?
It's a leap of faith to believe a person is automatically corrupted by using legal and publicly known campaign contributions.
Was Gillum corrupt when he accepted large and legal donations for his campaign?
In any case, campaign finance reform cannot go forward until Democrats are back in charge of the government. Your fixation on Democrats misses the real obstacle.
Bernie is a divisive leader, he has done nothing in 12 years. Cult of Sanders is going to be baying from now to the end of eternity about how awful every other Democrat is because you've already made up your mind. To make matters worse, Bernie isn't even a Democrat. Go form your own party.