US President Barack Obama talks on the phone in the Oval Office before making a statement to the media about the mission against Osama bin Laden, at the White House May 1, 2011.[Agencies]

WASHINGTON  - US President Barack Obama said the killing of Osama bin Laden marked a "good day for America." Polls show it was good day for the president, too.

Two surveys released Tuesday found the president's approval ratings climbed to 56 percent, a 9-point improvement over last month. The polls were conducted Monday, after details were released about the Navy SEAL raid on bin Laden's fortified compound north of Islamabad, the Pakistan capital. The results were reported by The Washington Post/Pew Research Center and USA Today/Gallup Poll.

Special Coverage:  US kills bin Laden

While the killing of bin Laden has seized American and world attention, such events can prove ephemeral, particularly after a brutal presidential campaign. Obama's improved approval after success in tracking down the world's most-wanted terrorist could mean little when voters enter polling booths 18 months from now.

Republicans lining up to challenge Obama will be banking on Americans to revert to pocketbook issues when they cast their ballots.

With no clear front-runner yet, some of the potential Republican field will gather for a first candidates' debate of the election season on Thursday in Greenville, South Carolina. There is no doubt the field of challengers will pound Obama about the nation's upward spiraling debt and what they see as a need to cut spending while rejecting tax increases.

Obama remains vulnerable on the economy. The Washington Post/Pew Research Center poll showed that only 40 percent of those surveyed approved of the president's handling of the economy. Other polls last week found that about 70 percent of Americans felt the country was on the wrong track.

The reason is obvious.

Even though the economy is slowly recovering from the Great Recession, unemployment remains near 9 percent, a high level for the US Gasoline prices have shot up to about $4 a gallon (almost a dollar a liter), roughly a third more than just six months ago. As household budgets are hit hard by rising fuel costs, big oil companies raked in record profits in the first quarter of 2011. US economic growth slowed sharply in the same period, partly because of high gasoline prices.

Home values continue to sink as financial institutions harvest huge earnings. The skyrocketing national debt is weighing heavily on the minds of taxpayers, who also fear the government will try to balance the budget by cutting away the social safety net for the poor and the elderly. The stock market and corporate profits are bounding upward, but middle class wages are stagnant or falling when adjusted for inflation.

While Obama has received generally broad bipartisan and international backing for the killing of bin Laden, Americans at the same time report increased fears about retaliatory al-Qaida attacks. The USA Today/Gallup Poll survey found that more than 6 in 10 of those contacted said a terrorist attack was likely in the coming weeks. That, the pollsters said, was "the highest rate of public nervousness in eight years."

Still the praise for Obama from unexpected quarters may portend a lingering betterment of the president's approval numbers. On the Senate floor Tuesday, Sen. John McCain, a frequent critic and Obama's Republican opponent in 2008, read out a statement in adulation of the military and intelligence personnel responsible for the killing of bin Laden.

Then the Vietnam war fighter pilot and prisoner of war spoke of Obama:

"I also want to offer my deepest congratulations and appreciation to the president and his national security team," McCain said, referring specifically to Obama's decision to forgo an aerial bombardment in favor of an airborne attack by Special Forces. "It took real courage to assume the many risks associated with putting boots on the ground, and I commend the president for it."

The polls surveyed randomly selected adults by telephone on May 2. The Post-Pew poll included 654 interviews; USA Today/Gallup interviewed 645. Both have a margin of sampling error of plus or minus 5 percentage points.