The Bill Richardson staff pass along video of the Governor's speech to the DNC's winter meeting. I don't know that he's an orator on the scale of John Edwards or Barack Obama, but he definitely has a record of accomplishments and knows how to talk to Democrats. Coturnix thinks he's merely the best vice-presidential candidate, but I think it's still too early to say.
I've seen Barack Obama and John Edwards speak in person, and they have a level of charisma that I don't feel in this video, and didn't see in Richardson's announcement on ABC's This Week. I don't know if that makes Richardson less of a campaigner, though. He does hold the world record for "most hands shaken in a day," a record he took from Teddy Roosevelt.