Eleven years after the last major effort to balance the federal government's books, advocates of fiscal integrity are seeking to make a comeback. Most notable is Pete Peterson, a son of Greek immigrants and Wall Street chieftain who has vowed to invest $1 billion of his personal fortune to alert Americans that their government is going broke. He has lured former U.S. comptroller general David Walker to his fledgling Peter G. Peterson Foundation, which will finance advertising, lobbying and grass-roots efforts designed to pressure the next president and Congress. The situation has gotten much worse since past presidents and Congress negotiated deficit-reduction deals in 1990, 1993 and 1997. The federal deficit is estimated at $357 billion. The national debt, as calculated by the Treasury Department, is more than $9.3 trillion. Future liabilities, from government pensions to elderly entitlements, bring the total to $53 trillion - $175,000 per person, according to Peterson and Walker. Both men say a comprehensive fix will need to include overhauls of the nation's health care and tax systems. At the core of the effort is Peterson, 82, a founder of the Concord Coalition fiscal watchdog group, who has preached the danger of federal budget deficits for decades. He and Walker spoke Tuesday at a House Budget Committee hearing and met privately with congressional backers of balanced budgets. Peterson is retiring this year as senior chairman of the Blackstone Group, which he co-founded. [He is a] former secretary of Commerce in the Nixon administration and chairman of Lehman Brothers.