The Campaign for Liberty website originated during Ron Paul's run in the 2008 presidential election and was maintained by his supporters as an organizing tool after he dropped out of that race. The administrative staff of the Campaign for Liberty forum includes six people who are currently working in key positions for the Ron Paul campaign, among them his campaign manger Jesse Benton. (Read here.)
The advertisement was posted by a Campaign for Liberty blogger named Clayton Douglas. Douglas has a long history of publishing literature and podcasts advocating on behalf of the white supremacist, militia and sovereign citizen movements. (Read here.) Bloggers are required to apply for blogging privileges at the Campaign for Liberty website and post there at the discretion of the forum's administrators.
The advertisement for Douglas' edition of the Protocols (which he sells for $25) has been posted at the Campaign for Liberty since 2008.