The underlying law in Citizen's United didn't just target corporations: it targeted unions, it targeted non-profits. That's why I'm asking about those other cases that would be banned. I understand wanting to ban Evil Inc., but are you ready to ban World Peace Non-Profit, too? Not only that, but Citizens United itself wasn't a corporation.
If you have a defensible case, that, yes, that'd be fine, go ahead. But when only individuals can spend money on politics, are we not in the same situation, where Bezos or Musk can afford an ad, but I cannot?