Thomas Mann, Senior Fellow, Governance Studies, The Brookings Institution & Resident Scholar, Institute of Governmental Studies, University of California, Berkeley

For the week of the Republican National Convention: Thomas Mann, Senior Fellow in Governance Studies at The Brookings Institution & Resident Scholar at the Institute of Governmental Studies, University of California, Berkeley, discusses polarization in politics and government and the Trump phenomenon ("the hostile takeover" of the Republican Party) -- all with David Helfenbein on this week's episode of The Gaggle. #politics #media #culture #Trump #polarization #Republicans #Democrats