Four years ago, Ron Johnson was a little-known businessman from Oshkosh who, at the urging of conservatives throughout the state, decided to throw his hat in the ring to challenge Russ Feingold.  This weekend, Ron will be attending the Republican Party of Wisconsin’s annual convention as the senior United States Senator for Wisconsin instead of as a new candidate seeking the nomination, but watching his introductory video from four years ago is a reminder of what is at stake — and why it is so important to continue to fight for freedom.