The White House race turned back to the ailing economy, with Democrat Barack Obama and Republican John McCain praising the vote in Congress to pass a Wall Street bailout but pushing for further action.
After the House of Representatives gave final approval to the $700 billion bailout of US financial institutions, Obama urged the Bush administration and Treasury Secretary Henry Paulson to use their authority wisely to protect taxpayers.
"Even if this rescue package works exactly as it should, it's only the beginning, it's not the end," Obama told reporters while campaigning in Pennsylvania.
McCain said the bailout was not a permanent solution and it was "an outrage" it was even necessary.
"Further action is needed and it shouldn't take a crisis to get this country to act and this Congress to act in a bipartisan fashion," the Arizona senator told reporters.
McCain, Obama and Obama's vice presidential running mate, Joe Biden, all US senators, voted for the measure last Wednesday when it was approved by the Senate.
New polls show Obama has solidified his national lead and gained an edge in crucial battleground states in recent weeks as the Wall Street crisis focused the attention of voters on the economy.
The vote in Congress occurred one day after Biden and McCain's running mate, Alaska Governor Sarah Palin, sparred on the economy and Iraq during a lively but polite vice-presidential debate.
The showdown drew the biggest television audience ever for a vice presidential debate, with nearly 70 million viewers, Nielsen Media Research reported, far more than the 52 million who watched Obama and McCain debate a couple of weeks ago.
Polls taken after the debate judged Biden the winner but Palin's steady performance was stronger than many voters expected and calmed the nerves of Republicans worried about whether she was up to the job.
"How about Sarah Palin last night?" McCain asked supporters in Pueblo, Colorado.
Both McCain and Obama pledged to bring economic relief for the middle class after the US government reported employers slashed 159,000 jobs in September - the ninth straight month of job losses.
But they took shots at each other's economic approach. Each candidate claimed to be the best prepared to lead the United States out of its economic crisis.
"This country can't afford Senator McCain's plan to give America four more years of the same policies that have devastated our middle class and our economy for the last eight," Obama said, again linking McCain to unpopular President George W. Bush.
McCain also recycled his frequent criticism of Obama's plan to raise taxes on Americans who make more than $250,000 a year. Obama will give a tax cut to those making less.
Biden was back in Delaware on Friday, where he bid farewell to his son Joseph 'Beau' Biden III, 39, and members of his Delaware National Guard unit who are reporting to Texas before heading to Iraq.
McCain and Obama will reclaim the campaign spotlight on Tuesday when they meet in their second presidential debate in Nashville, Tennessee.