Challenges to Democracy 2001 HKS Authors See citation below for complete author information. Pippa Norris Paul F. McGuire Lecturer in Comparative Politics Citation Norris, Pippa. "A Virtuous Circle? The Impact of Political Communications in Post-Industrial Democracies." Challenges to Democracy. Ed. Keith Dowding, James Hughes, and Helen Margetts. Palgrave Publishers, 2001, 100-117.