Barack Obama, his re-election in doubt, promised better days ahead as he accepted the Democratic Party nomination for president before thousands of charged-up party loyalists and millions of television viewers.
In a crucial speech at the Democratic National Convention, just two months before the November 6 vote, Mr Obama looked to reignite the excitement that powered his first run for the presidency.
Mr Obama needed to win over undecided voters, especially those who had been swayed by his inspiring message of hope in 2008, but now feel disillusioned after years of economic weakness and persistent political bickering.
He assured them: "Our problems can be solved, our challenges can be met.
"Yes, our path is harder - but it leads to a better place," he said.
Mr Obama built on the message delivered throughout the convention: that America is on the road to recovery while Republican rival Mitt Romney would revive failed policies, cutting taxes for the rich and slashing programs that give regular Americans a chance for a more prosperous future.
Republicans, who nominated Mr Romney last week, argue that America's high 8.3% unemployment rate is proof that Mr Obama's policies have failed and that the president's spendthrift, big-government policies have hurt business and caused the federal deficit to soar.
The two candidates are locked in tight race. Polls show that Mr Romney, a wealthy businessman and former governor of Massachusetts, is seen as the better candidate for improving the economy, while Mr Obama is viewed as more likeable and having a better understanding of everyday Americans.
Mr Obama's speech marked the climax of the three-day convention. First lady Michelle Obama highlighted the first day, talking about her husband's humble roots and compassion for those living through tough times.
Bill Clinton, the popular former president who led the United States during years of prosperity, gave a rousing speech yesterday, vouching for Mr Obama's economic policies and urging Americans not to turn back to Republicans.
After Mr Clinton's speech, Democrats formally approved Mr Obama's nomination in a roll-call vote.
Among the speakers preceding Mr Obama were actress Eva Longoria and Vice President Joe Biden, who was formally re-nominated. "We're on a mission to move this nation forward - from doubt and downturn to promise and prosperity," Mr Biden said in his acceptance speech.