Political polarisation in America. Laurie Taylor talks to Marc Hetherington, Professor of Political Science at Vanderbilt University, about why distrust of the opposite party is now so common in the US. Is the same pattern emerging in Britain? They're joined by Robert Ford, Professor of Political Science at the University of Manchester. Also, an anthropologist's guide to names and naming with Barbara Bodenhorn, Emeritus Fellow, Pembroke College, University of Cambridge. Producer: Jayne Egerton.