WASHINGTON  This much is known: About 7:15 Tuesday night, a glittering blonde, decked out in a red and gold sari, holding the hand of her black-tuxedoed escort, swept past the camera crews and reporters camped out to catch the red-carpet arrivals for the first state dinner given by President Obama.

“Hey, that’s a Desperate Housewife!” one reporter yelled out, alluding to the TV series named for a collection of them.

In fact, the couple  Michaele Salahi and her husband, Tareq  are Virginians who have been auditioning for a possible role in a different housewives TV franchise: “The Real Housewives of Washington.”

They swept past the camera crews and followed the trail of other bigwigs attending the dinner.

But neither Mr. nor Mrs. Salahi, best known in the Washington area for promoting wine and polo in Virginia, were on the guest list for the event, a fact first reported Wednesday morning on the Washington Post Web site.