President Barack Obama looks on after announcing he is keeping Federal Reserve Board Chairman Ben Bernanke, left, for a second term, Tuesday, Aug. 25, 2009. (The Associated Press)

As he looks forward to a second term as chairman of the Federal Reserve, Ben Bernanke's biggest challenge will be to undo much of what made him a hero during his first term.

In nominating Bernanke last week, President Barack Obama praised the Fed chairman for his "bold action and out-of-the-box thinking," saying it had helped avoid a repeat of the Great Depression.

But most of those bold actions -- lending hundreds of billions of dollars to banks and businesses, slashing overnight interest rates to nearly zero, having the Fed almost single-handedly finance the mortgage market -- will have to be reversed or rolled back over the next few years.

If the Fed shifts too quickly from the role of savior to that of strict disciplinarian, it risks aborting the recovery and tipping the nation back into a recession, essentially repeating mistakes made in 1937 after the economy had begun to rebound. If the Fed moves too slowly, it risks the kind of intractable inflation it experienced in the 1970s and fueling another bubble.

Compounding the problem is the federal government's fiscal woes, made clear by an announcement on Tuesday that the budget deficit would be greater than previously projected.

For the first time in almost 20 years, the Fed may soon have to make unpopular decisions that raise the cost of borrowing even when the economy still feels weak. It has already decided it must


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tolerate high unemployment, which the Obama administration said last week would exceed 10 percent, through at least the end of next year. It is already phasing out smaller programs to provide emergency credit, and will have to decide when to scale back bigger ones.

At some point next year, the Fed may well need to raise interest rates -- possibly rapidly and sharply, given how far it cut them last year -- and in the process raising the cost of things likes credit cards, mortgages and business loans.

Any or all of those actions will probably restrain economic growth and keep unemployment rates high, potentially putting the Bernanke Fed on a collision course with the Obama White House.

The federal government's enormous fiscal problem makes that clash more likely. The White House estimated on Tuesday that the government faces a $9 trillion budget shortfall over the next 10 years. The annual deficits will exceed $1 trillion through 2011, the administration said, and the annual cost of paying interest on the debt would exceed $600 billion in 2019.

The government's enormous borrowing needs will probably put pressure on the private sector after the economy begins to expand. If that happens, investors may demand higher interest rates on Treasury securities and ultimately drive up borrowing costs for government and businesses alike.

The Fed has faced that kind of conflict before, and the politics were not pretty. Paul Volcker, the Fed chairman who tamed inflation in the early 1980s by raising the federal funds rate to 20 percent, came under attack from businesses, farmers and President Ronald Reagan's White House.

In the early 1990s, Fed Chairman Alan Greenspan faced pressure when President George Bush wanted him to cut interest rates more quickly. Many alumni of the first Bush administration blame Greenspan for Bush's re-election defeat in 1992.

What worries some experts, including Bernanke, is that the Fed's expanding role during the financial crisis exposes it to political pressure. Lawmakers, having seen the Fed bail out corporations and extend credit to entire industries, have prodded the central bank to help out other constituencies, such as recreational vehicle manufacturers.

The Fed's political critics are multiplying. A bill sponsored by Rep. Ron Paul, R-Texas, would empower the Government Accountability Office to "audit" the Fed's decisions on interest rates. Bernanke and other Fed officials have warned that would damage the Fed's independence. Still, the measure has been signed by more than 250 lawmakers in both parties.

Obama, announcing his decision to nominate Bernanke for another term, vowed to "continue to maintain a strong and independent Federal Reserve."

And in supporting Bernanke, a Republican first appointed by President George W. Bush, Obama signaled that he was willing to rise above party loyalties. "Ben approached a financial system on the verge of collapse with calm and wisdom," Obama said.

Unless a disaster erupts out of nowhere, Bernanke's Senate confirmation appears certain.

At the Fed's annual symposium in Jackson Hole, Wyo., last weekend, some analysts criticized Bernanke for sending contradictory signals.

"The Fed is simultaneously promising to keep interest rates low for an extended period, while also promising to keep inflation from rising," said Carl Walsh, a professor of economics at the University of California, Santa Cruz, in a paper delivered at the conference.

Fed officials disagreed with his assessment, countering that inflation is, if anything, at risk of being lower than they would like.

"The low interest rates are designed to keep inflation from falling, and falling persistently below where we want them to be," said Donald Kohn, vice chairman of the Federal Reserve.

For the moment, Bernanke has some breathing room. Even though the federal government is borrowing at a staggering pace, American businesses and consumers have slowed their own borrowing so much that the U.S. total is down from previous years.

Foreign investors seeking a haven have plowed vast amounts of money into Treasury securities. As a result, interest rates on long-term Treasury bonds, which directly influence interest rates on corporate loans and home mortgages, remain low.

But as business activity picks up around the world, the competition among debt issuers is likely to increase and interest rates could rise. Clashing priorities are not hard to imagine. The Obama White House might want to lift a sluggish recovery by keeping interest rates low. And the Bernanke Fed may want to head off inflation -- before it is too late.