AUSTIN, Texas — David M. Walker sure talks like he's running for office.

"This is about the future of our country, our kids and grandkids," the comptroller general of the United States warns a packed hall at Austin's historic Driskill Hotel. "We the people have to rise up to make sure things get changed."

But Walker doesn't want, or need, your vote this November. He already has a job as head of the Government Accountability Office, an investigative arm of Congress that audits and evaluates the performance of the federal government.

Basically, that makes Walker the nation's accountant-in-chief. And the accountant-in-chief's professional opinion is that the American public needs to tell Washington it's time to steer the nation off the path to financial ruin.

From the hustings and the airwaves this campaign season, America's political class can be heard debating Capitol Hill sex scandals, the wisdom of the war in Iraq and which party is tougher on terror. Democrats and Republicans talk of cutting taxes to make life easier for the American people.

What they don't talk about is a dirty little secret everyone in Washington knows, or at least should. Most economists and budget analysts agree: The ship of state is on a disastrous course, and will founder on the reefs of economic disaster if nothing is done to correct it.

POLITICALLY SUICIDAL

There's a good reason politicians don't like to talk about the nation's long-term fiscal prospects. The subject is short on political theatrics and long on complicated economics, scary graphs and very big numbers. It reveals serious problems and offers no easy solutions. Anybody who wanted to deal with it seriously would have to talk about raising taxes and cutting benefits, nasty nostrums that might doom any candidate who prescribed them.

"There's no sexiness to it," laments Leita Hart-Fanta, an accountant who has just heard Walker's pitch. She suggests recruiting a trusted celebrity — maybe Oprah — to sell fiscal responsibility to the American people.

Walker doesn't want to make balancing the federal government's books sexy — he just wants to make it politically palatable. He has committed to touring the nation through the 2008 elections, talking to anybody who will listen about the fiscal black hole Washington has dug itself, the "demographic tsunami" that will come when the baby-boom generation begins retiring and the recklessness of borrowing money from foreign lenders to pay for the operation of the U.S. government.

Walker can talk in public about the nation's impending fiscal crisis because he has one of the most secure jobs in Washington. As comptroller general of the United States — basically, the government's chief accountant — he is serving a 15-year term that runs through 2013.

This year, Walker has spoken to the Union League Club of Chicago and the Rotary Club of Atlanta, the Sons of the American Revolution and the World Future Society. But the backbone of his campaign has been the Fiscal Wake-up Tour, a traveling roadshow of economists and budget analysts who share Walker's concern for the nation's budgetary future.

"You can't solve a problem until the majority of the people believe you have a problem that needs to be solved," Walker says.

MOST SEEM UNAWARE

Polls suggest that Americans have only a vague sense of their government's long-term fiscal prospects. When pollsters ask Americans to name the most important problem facing America today — as a CBS News/New York Times poll of 1,131 Americans did in September — issues such as the war in Iraq, terrorism, jobs and the economy are most frequently mentioned. The deficit doesn't even crack the top 10.

Yet on the rare occasions that pollsters ask directly about the deficit, at least some people appear to recognize it as a problem. In a survey of 807 Americans last year by the Pew Center for the People and the Press, 42 percent of respondents said reducing the deficit should be a top priority; another 38 percent said it was important but a lower priority.

So most of the public appears to agree with Walker that the deficit is a serious problem, but only when they're made to think about it. Walker's challenge is to get people not just to think about it, but to pressure politicians to make the hard choices that are needed to keep the situation from spiraling out of control.

To show that the looming fiscal crisis is not a partisan issue, he brings along economists and budget analysts from across the political spectrum. In Austin, he's accompanied by Diane Lim Rogers, a liberal economist from the Brookings Institution, and Alison Acosta Fraser, director of the Roe Institute for Economic Policy Studies at the Heritage Foundation, a conservative think tank.

"We all agree on what the choices are and what the numbers are," Fraser says.

Their basic message is this: If the United States government conducts business as usual over the next few decades, a deficit that is already $8.5 trillion could reach $46 trillion or more, adjusted for inflation. That's almost as much as the total net worth of every person in America — Bill Gates, Warren Buffett and those Google guys included.

A hole that big could paralyze the U.S. economy; according to some projections, just the interest payments on a debt that big would be as much as all the taxes the government collects today.

And every year that nothing is done about it, Walker says, the problem grows by $2 trillion to $3 trillion.

People who remember Ross Perot's rants in the 1992 presidential election may think of the federal debt as a problem of the past. But it never really went away after Perot made it an issue, it only took a breather. The federal government actually produced a surplus for a few years during the 1990s, thanks to a booming economy and fiscal restraint imposed by laws that were passed early in the decade. And though the federal debt has grown in dollar terms since 2001, it hasn't grown dramatically relative to the size of the economy.

THE BOOMER BUST

But that's about to change, thanks to the country's three big entitlement programs — Social Security, Medicaid and especially Medicare. Medicaid and Medicare have grown progressively more expensive as the cost of healthcare has dramatically outpaced inflation over the past 30 years, a trend that is expected to continue for at least another decade or two.

And with the first boomers becoming eligible for Social Security in 2008 and for Medicare in 2011, the expenses of those two programs are about to increase dramatically due to demographic pressures. People are also living longer, which makes any program that provides benefits to retirees more expensive.

Medicare already costs four times as much as it did in 1970, measured as a percentage of the nation's gross domestic product. It currently comprises 13 percent of federal spending; by 2030, the Congressional Budget Office projects, it will consume nearly a quarter of the budget.

Economists Jagadeesh Gokhale of the American Enterprise Institute and Kent Smetters of the University of Pennsylvania have an even scarier way of looking at Medicare. Their method calculates the program's long-term fiscal shortfall — the annual difference between its dedicated revenues and costs — over time.

By 2030, they calculate, Medicare will be about $5 trillion in the hole, measured in 2004 dollars. By 2080, the fiscal imbalance will have risen to $25 trillion. And in projecting the gap out to an infinite time horizon, it reaches $60 trillion.

SOCIAL SECURITY, TOO

Social Security is a much less serious problem. The program currently pays for itself with a 12.4 percent payroll tax, and even produces a surplus that the government raids every year to pay other bills. But Social Security will begin to run deficits during the next century, and ultimately would need an infusion of $8 trillion if the government planned to keep its promises to every beneficiary.

Why is America so fiscally unprepared for the next century? Like many of its citizens, the United States has spent the last few years racking up debt instead of saving for the future. Foreign lenders — primarily the central banks of China, Japan and other big U.S. trading partners — have been eager to lend the government money at low interest rates, making the current $8.5 trillion deficit about as painful as a big balance on a zero-percent credit card.

Macro-economic meltdown is probably preventable, says Anjan Thakor, a professor of finance at Washington University in St. Louis. But to keep it at bay, he said, the government is essentially going to have to renegotiate some of the promises it has made to its citizens, probably by some combination of tax increases and benefit cuts.