Edie Falco is fidgeting and looks nervous. The star of "The Sopranos" admits to her North Carolina audience that she's a product of lower Manhattan who barely understands voters above 14th Street. She talks for just five minutes and never mentions John McCain or George Bush.

"I've never had any intentions of trying to change anybody's mind," says Falco, a Barack Obama supporter. "I've heard a lot of celebrities talking about politics who, in my estimation, are not qualified to do so."

She adds, "Frankly, I'm embarrassed sometimes that they are representing my ilk, if you will."

For the seemingly endless number of celebrities who back Obama, trying to persuade people who already support the Illinois senator to volunteer for his campaign is as important as swaying undecided voters.

Four years ago, rocker Bruce Springsteen was the face of celebrity politics, making his first public endorsement of a candidate with a column in The New York Times before leading a series of swing-state concerts to urge a vote for Democratic nominee John Kerry.

While Obama has his share of celebrity concerts and endorsements — singer Dave Matthews playing a show in his home state of Virginia, legendary driver and team owner Junior Johnson sending an e-mail to NASCAR fans — he is using his support among famous faces differently.