[gridlock]

Bill Clinton may have more influence than Oprah. But the people who are influenced by Bill Clinton are already in the tank for Hillary!. More volume from Bill Clinton is not going to change that, because people know that Bill Clinton has (presumably) been supporting Hillary! Clinton all along.

Oprah, OTOH, is a new force on the scene. She is in a position to move people who have not already been moved.

[twigs]

I think that’s right. She will get people out to hear Obama who would probably not have heard him and his message before. He shows nicer than Hillary. She’s abrasive, which is about the nicest thing I can think of to say about her.

[Rudder]

"...44 percent of Democratic primary voters said they were more likely to vote for Hillary because of her husband."

As you pointed out these people are already in the tank for her, anyway. Furthermore, Hillary's entire political career is Bill, always has been.