Even the small film maker or newspaper is usually going to be organized as an LLC, even if it is just a single person trying to submit their film to a festival or something. These should be subject to governmental regulation if they touch on political topics? I think this is significantly thornier than you're making it out to be.
> Campaign finance is equally simple: run your campaign on public funding. Give all candidates who meet a threshold equal amounts of money.
Right, where it gets tricky is with unaffiliated individuals and what counts as a campaign expense versus speech or normal business.