Editor's note: The following commentary is excerpted from Jack Cashill's eye-opening new book, "Hoodwinked: How Intellectual Hucksters Have Hijacked American Culture," where he shows how, over the last century, "progressive" writers and producers have been using falsehood and fraud as their primary weapons in their attack on America. Although Planned Parenthood has tried desperately to shred the files of its founding mother, Margaret Sanger herself has left a detailed record of how she lived and how she thought. The most unimpeachable source of the former is her autobiography, written in 1938, and of the latter, her landmark book, "The Pivot...