John C. Courtney, The Brookings Institution, June 2008
Ruy Teixeira and Karlyn Bowman, Wall Street Journal, February 28, 2008
Clive Crook, Financial Times, November 11, 2007
Richard Walker, The Brookings Institution, December 2006
Norman J. Ornstein and Thomas E. Mann, The NewsHour with Jim Lehrer, November 14, 2006