It was really a homeschool textbook that got me moving in my junior year of high school. I had a class on government (I picked it, as I did not know much about social studies), and read this book with amazement. When the Constitution was covered, what was stated in it was so plain and clear, and yet I knew it wasn't followed. I wondered why it was ignored and what could be done to fix it. The writers of the book (some large Christian university out east; I don't remember the name) made excuse after excuse for the path of the government, but I refused to buy it. That started a chain reaction that would not be stopped.
Since I had just turned 18, and having already been on a path of questioning what I had been told by Republicans, the media (particularly Limbaugh, as I had been a big listener in jr. high and high school), and just conventional wisdom, I was open to any candidate. I had considered joining the Constitution Party or Libertarian Party, but didn't see them going anywhere soon. So I had no outlet for my strong beliefs.
I was on another (very small) forum and there was a thread around June '07 discussing the '08 Republican nomination race. Someone mentioned he was supporting Ron Paul, so I googled him and looked up his issues page. I saw he was totally right about everthing—the perfect candidate it seemed—save for the wars. (Yes, it is very possible to be pro-war and a small-government conservative, albeit a mislead one.) I said, "Well, if he's exactly right about all of these things, he might be right on the wars too. But he probably doesn't have a chance." So I forgot about him for a while and continued on.
Later down the road (probably around September), I had come to a point where I believed the wars were not in our best interests, and that Ron Paul was right, so I started looking into Ron Paul again. I was paying some attention to the debates, and read RPF some. I decided that if Ron Paul was right, I needed to support him if I wanted to have any shred of credibility. Even if he wasn't going to win, I was going to still support him. I eventually donated during the November 5th money bomb and that set history in stone.