In today's highly polarised political landscape, Liberalism, somewhere in the middle, often comes under attack from both right and left. Joshua L Cherniss is Associate Professor of Government at Georgetown University and his new book, Liberalism in Dark Times, looks at why moderate, centre-ground voices are having to think smarter and talk louder to be heard. He joins journalist and broadcaster Georgina Godwin to discuss both the history and the potential future of Liberalism.

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