Well...in history nobody has ever needed a document to start an uprising. And we aren't going to see one (atleast in the US) today cause most people have better things to do with their lives.
But yes, the Protestant theologian is a great example. The short time delay from the printing press to the Reformation, I think, highlights the immense power of the written word.
In modern America, I suspect the medium is more likely to be television than text.