Tell me, then, is writing a blog post speech?

Okay, what if I were to take several blog posts and put them together, have them published, and pay for the publishing myself. Is that speech?

What if I were to make a video and pay for the production myself and give it away on the Internet? Is that speech?

What if I took that same video and bought air time on the national networks? Is that speech?

My point is, while speech isn't money, speech and money are inseparable. It's impossible to regulate money in politics without infringing in some way on freedom of speech.