The "Young Guns" have a book. They also have a promotion tour and a video. Now, the Democrats could engage in a battle of ideas. But that's not what they do. (are you surprised?)
Instead the Democratic Congressional Campaign Committee files a complaint with the Federal Election Commission that promoting the book violates election law. Really. By their interpretation, a book publisher cannot promote a book if it is political.
What is the mechanism? The publisher posts a video by the authors about their book that contains a link to a website that takes political contributions. It is after all, a political manifesto.
Restating, Democrats use the power of the federal government to attempt to prohibit the political speech and promotion of speech by their political enemies. That's the kind of thing that lead to the American Revolution. Tea Parties make perfect sense in this context.