Well, it is my opinion as supported by the SCOTUS, that political spending is protected under the First Amendment. That is the fundamental premise of Citizens United. Specifically, In a 5-4 decision, the U.S. Supreme Court ruled that corporations and unions have the same political speech rights as individuals under the First Amendment. It found no compelling government interest for prohibiting corporations and unions from using their general treasury funds to make election-related independent expenditures.
Additionally, in an 8-1 decision, the Court ruled that the disclaimer and disclosure requirements associated with electioneering communications are constitutional.
You folks need to understand that a lot of this started in the 1976 decision Buckley v. Valeo. That case established the legal framework sanctioning billions of dollars of independent private campaign spending. In it, the Court ruled that limits on campaign donations — direct donations to candidates — are constitutional but said it was unconstitutional to limit non-donation expenditures, such as independently funded advertisements. Since Buckley protected money as speech, the only question was whether corporations were legitimate speakers. It may surprise some to hear, but the Court had already answered this question in
1978. In
First National Bank of Boston v. Bellotti, the Supreme Court recognized a corporate right to free speech, concluding that the value of speech in the course of political debate does not depend on the identity of the speaker. Citizens simply followed the precedent of these two cases.
So when liberals intone that “corporations aren’t people,” thinking they are making a knock-down argument against Citizens, they miss the point. Citizens did not make corporations persons. And corporations do not need to be persons to receive First Amendment protections. Citizens upheld the liberty, provided by Bellotti, of corporations to speak, and they speak under the rules provided by Buckley.
https://www.vox.com/the-big-idea/201...hers-primaries
There were some other older decisions but this of recent vintage gets us there. I hope this helps.