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“I’ll vote for Al Gore if he runs,” said Brant Schweinsberj, 28, of Somerset, N.J. “Why? I think he is the most capable candidate, and I don’t have a second choice.”

James Boyce, who was blogging live for Huffington Post yesterday, said a New Hampshire poll showing that Mr. Gore would win the state’s primary if he ran for president is a key indicator.

“The support is real,” said Mr. Boyce, a Democratic political strategist who was a senior adviser to presidential nominee Sen. John Kerry in 2004. “Polling and the sincere public support clearly show that if Al Gore wants to be president, he will be the nominee and he will be the president.”

“I would be thrilled. If he ran, he would win,” said yogurt magnate Gary Hirshberg, the chief executive officer of Live Earth sponsor Stonyfield Farm in New Hampshire.

Mr. Hirshberg, a longtime Democratic activist whose group offered concertgoers free yogurt and the environmental scores of major companies, said he thinks a presidential campaign “might not be anything but a distraction” for Mr. Gore.

“He’s doing an immense amount of good right now,” he said.

Mr. Gore initially wanted his U.S. show to be on the Mall in Washington, but the venue was taken for the Smithsonian Folklife Festival. He opted instead for the U.S. Capitol grounds, but Senate Republicans blocked a bipartisan resolution authorizing the show, calling it a “partisan political event.” Mr. Gore then took Live Earth to New Jersey.

The Museum of the American Indian, also on the Mall, agreed at the last minute to host a small arm of the concert with Garth Brooks and Trisha Yearwood.

Mr. Gore told the Associated Press that his nonprofit, the Alliance for Climate Protection, will act as a “PR agent,” and he views the concerts as the beginning of a three-year effort to make a difference. The goal is to get millions of people around the globe to pressure their government leaders on the environment and policy.

Organizers stressed that the environment shouldn’t be a partisan issue.

“It would be a huge mistake if this became a Democratic or Republican issue,” said Tom Lalley of the World Wildlife Fund, who traveled with a giant panda and distributed paper fans reading, “I’m hotter than I should be.”

Critics noted the massive carbon footprints of the jet-setting musicians.

Miss Tunstall, wearing a “Save the Future” tank top, fired back, saying she is putting solar panels on her apartment in London and travels eco-friendly Virgin Airlines.

A band member from Taking Back Sunday said he runs his old Volkswagen Rabbit on used vegetable oil dumped by a Chinese restaurant. Rock star Dave Matthews said his family uses cloth diapers but also stressed the call to action for elected leaders.

The stadium had separate containers for waste, compost and recycling bottles and cans. The lights were energy-efficient, and the floorboards over the New York Giants field were made of a bioproduct instead of plywood. Organizers also plan to buy carbon offsets from a green energy company.

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