The news media's treatment of foundation involvement in public policy may have changed forever on March 17. That was the day the New York Post published "Buying 'Reform': Media Missed Millionaires' Scam," an account by one of its columnists, Ryan Sager, of the massive spending by several mainstream foundations to secure passage of the 2002 overhaul of campaign-finance laws and to keep the issue alive. Mr. Sager told his readers he had discovered "an immense scam perpetrated on the American people by a cadre of left-wing foundations and disguised as a 'mass movement.'" Foundations like Ford, Open Society, Carnegie, Joyce,...