Bruce Springsteen called the Bush presidency "a disaster" and said many Americans have "justifiably lost faith" in the American dream, during a free outdoor concert attended by tens of thousands of people in Philadelphia.

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The legendary rocker interrupted a seven-song acoustic set at a voter-registration rally to praise Democrat Barack Obama and bemoan the crises facing the next president.

Springsteen said that America remains a house of dreams for some, but that too many people have given up on the promise of fairness and equality.

"I've spent 35 years writing about America and its people and the meaning of the American promise - a promise handed down right here in this city," said the New Jersey rocker, whose songs often depict down-on-their-luck, working-class dreamers. "Our everyday citizens ... have justifiably lost faith in its meaning."

The rally, planned by the Obama campaign a week ago, drew tens of thousands of people to the Benjamin Franklin Parkway. Springsteen approached the campaign and asked to help out, an Obama aide said. The Philadelphia event came just days before Monday's voter registration deadline in Pennsylvania.

"The Boss" also plans to perform at Obama gatherings in Ohio on Sunday and Michigan on Monday. On October 16, he will join Billy Joel at an Obama fundraiser in New York City.

Bush administration failures

Springsteen cited the Iraq war, the recent economic turmoil and Hurricane Katrina as examples of the Bush administration's failures. He bookended the set with his rock classic "Promised Land" and Woody Guthrie's folk anthem, "This Land is My Land."

The Obama camp says its registration efforts have helped give Democrats a 1.2 million-voter advantage over Republicans in Pennsylvania, up from a 580,000-voter lead in 2004. The most recent Quinnipiac University poll, conducted late last month, showed Obama with a 54 per cent to 39 per cent lead over Republican John McCain among likely state voters.