Stanley B. Greenberg is chairman of Greenberg Research, Inc., a national survey and polling firm. He was pollster to Bill Clinton's presidential campaign in 1992 and polling adviser to Nelson Mandela in 1994 and Tony Blair in 1997. Theda Skocpol is professor of government and sociology at Harvard University and author of the prize-winning 1992 book Protecting Soldiers and Mothers and of Boomerang: Health Reform and the Turn Against Government.