Citizens United proves we won't do any better this time around.
1. The idea of corporate personhood predates CU by over a century and the Supreme Court had already asserted that corporations enjoyed certain constitutional protections in previous decisions.
2. Far from inventing the idea, the CU decision didn't even rest on corporate personhood, but on the idea of the freedom of speech generally. The logic of the majority was that speech itself is protected, irrespective to whether the speaker is a person or an organization. The First Amendment covers individuals, but also newspapers, book publishers, radio stations, and so on, and that should extend (they said) to non-media corporations. No assertion of personhood necessary.
The problem, in my opinion, is that that conclusion combined with previous decisions that treated limits on spending as limits on speech, allowed for unlimited spending. The majority also naively asserted that independent spending posed no risk of corruption, which I think is laughable.
It's interesting to me that one can look back at the effects that decision has had on the US and say it "was 100% correct."
It's a bit like sitting in the burning ruins of Rome and contemplating that Nero was 100% correct to focus on his music. I mean, I'm glad he got to do what he loves, but maybe 100% is just a tiny bit of an overstatement.
The court's job is to uphold the law. If you disagree with their interpretation, you can call them incorrect. If you have a problem with the consequences of the law, you have a problem with the legislature.
The above is true, but also: companies simply are not people, and they should not be supported above the individual, which was the consequences of that decision. Money is not the same as speech. treating it as such creates an aristocracy: something America as a country rebelled against during it's formation.
How so? If the answer is "Trump" I certainly won't disagree on the catastrophic part, but he didn't get elected because of money; in all three elections his campaign was substantially outspent by his opponents.
That is a major part of the reasoning for the Supreme Court rulings on the matter of corporate political funding.