Stephen Macedo, Yvette M Alex-Assensoh, Jeffrey M. Berry, Michael Brintnall, David E. Campbell, Luis Ricardo Fraga, Archon Fung, William A. Galston, Christopher F. Karpowitz, Margaret Levi, Meira Levinson, Keena Lipsitz, Richard G. Niemi, Robert D. Putnam, Wendy M. Rahn, Keith Reeves, Rob Reich, Robert R. Rodgers, Todd Swanstrom, Katherine Cramer Walsh,
Democracy at Risk: How Political Choices Undermine Citizen Participation, and What We Can Do About It ,(2006)