Wendell Pierce at the inauguration.

You probably know him as Bunk, a k a Detective William Moreland, who teamed with Detective Jimmy McNulty in HBO’s The Wire. Or maybe music’s your thing, and you know him as Antoine Batiste, the trombonist who fronts Antoine Batiste and his Soul Apostles on Treme, another HBO hit.

As the star of two shows that have earned cult followings, plus memorable appearances on Law & Order and Third Watch, it’s likely you know New Orleans native Wendell Pierce from somewhere.

Mr. Pierce was on hand Monday for the inauguration of President Barack Obama, and while he was there to celebrate the country’s leader, he had plenty of time for the dozens of fans who stopped by to pay homage. He was exceedingly gracious, smiling through autographs and handshakes and making time for anyone with a camera.

Though his job likely puts him in a tax bracket most can only dream of, Mr. Pierce seemed to identify with Mr. Obama’s populist message, joining in the applause when the president spoke of the “shrinking few” who do very well and the “growing many barely making it.”

Bunk proved he’s not just another bobblehead in pancake makeup when one well-wisher asked what he was up to these days. Pierce rolled through the on-screen projects he’s part of, before the fan interrupted to ask about the “real work.”

“That’s the acting. What about the things you’re doing in New Orleans?” asked the man, who was in from New Jersey.

“We’re trying to rebuild,” Mr. Pierce said. “Always trying.”

Since Hurricane Katrina, Mr. Pierce has made rebuilding the battered city his cause. To that end, the actor and two partners are opening a chain of grocery stores in the city designed to serve “food deserts”—low-income neighborhoods that have been without access to quality fresh food since the storm. Mr. Pierce was also instrumental in the construction of a green community in Pontchartrain Park, the neighborhood where he grew up.

It’s no surprise Mr. Pierce trekked to D.C. for the inauguration. He served as a surrogate for Mr. Obama during his campaign and was a visible presence at the Democratic National Convention last fall. He also raised at least $50,000 as one of Mr. Obama’s team of celebrity bundlers. What was a nice surprise, however—and possibly a very early sign of the harmony the president said he would seek in his second term—was seeing a Hollywood star stand in the cold for as long as it took his many fans to wrangle their iPhones into Instagram mode.

Mr. Simon spent a good chunk of his career as a crime reporter at The Baltimore Sun. He set much of the fifth season of The Wire in the post-Tribune newsroom of The Sun.

At one point during the lunch, Rebecca Dana of The Daily Beast asked Mr. Simon how much of a role, if any, The New Orleans Times-Picayune would play in the new series.

Mr. Simon said that while shooting the first season of Treme, he spent one day at the Times-Picayune offices where the bosses struck him as a touch nervous about his presence (the portrayal of The Baltimore Sun executives in The Wire was something less than sunny).

But it sounds like the Times-Picayune brass have little to worry about. From what he said today, Mr. Simon didn't sound like a man interested in devoting another season of TV to plumbing the sad dramatic depths of today's daily newspaper culture.

"Never tell the same story twice," said Mr. Simon.

That said, Mr. Simon did put one group of media types on notice--namely, the judges of the Emmy awards.

Mr. Simon said that if Wendell Piece, who stars in Treme, doesn't win an Emmy for his work in the series that Mr. Simon would travel to L.A. personally to slash the tires of the no-good judges.