Which landmark Supreme Court case on campaign finance first equated spending money with the right of free speech?

Question

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In the Buckley v. Valeo case in 1976, the Supreme Court ruled that limiting campaign expenditures violated the First Amendment right of free speech, equating spending money with the right to speak. This ruling paved the way for future campaign finance decisions that allowed for greater spending in political campaigns.

Which Landmark Supreme Court Case on Campaign Finance First Equated