there are a variety of legal cases that cover this, such as Buckley v. Valeo: https://en.wikipedia.org/wiki/Buckley_v._Valeo https://en.wikipedia.org/wiki/Buck

there are a variety of legal cases that cover this, such as Buckley v. Valeo: https://en.wikipedia.org/wiki/Buckley_v._Valeo https://en.wikipedia.org/wiki/Buckley_v._Valeo "The majority, in a per curiam opinion, contended that expenditure limits contravened the First Amendment provision on freedom of speech because spending money, in its view, was the same as written or verbal expression."