By Alex Henderson Ken Burns’ new three-part documentary, “The U.S. and the Holocaust,” which will air on PBS September 18-20, comes at a time when a variety of political figures — from Sen. Bernie Sanders of Vermont, a self-described “democratic socialist,” and leftist author Noam Chomsky to arch-conservative Rep. Liz Cheney of Wyoming and former Nancy Reagan speechwriter Mona Charen — are sounding the alarm about the state of U.S. democracy and a far-right authoritarian movement within the Republican Party. Burns’ documentary, directed and produced with Lynn Novick and Sarah Botstein, focuses…
