In any case, I've never accepted the idea that corporate money is somehow inherently bad, or that it benefits the "donor class" against the interests of the "people." Bernie and other progressives can go around saying that; I think it's crap.
When we look back at the liberal successes of the last decade, including gay rights and the MeToo movement, we're going to see that corporations played a huge role. Not because they necessarily wanted to or out of any sense of altruism, but because they are better in tune to public attitude changes than our politicians are. If there is to be real gun control, or action on climate change, or a solution to our immigration problems, it will come because corporations respond to public pressure by withdrawing money from politicians who oppose the majority viewpoint. And that's a good thing.