New York Times best-selling author and conservative activist David Horowitz joined Glenn Beck on Tuesday's show to talk about his new book, "Dark Agenda: The War to Destroy Christian America." David reveals how the left is destroying America's heritage and how our country's Judeo-Christian values are under attack by radicals who seek to undermine the religious liberties established by our founding fathers and the Declaration of Independence.

Watch the video below to see an excerpt from the show:

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