[cnn-photo-caption image= http://i.cdn.turner.com/cnn/2008/images/06/03/art.carter.gi.jpg caption=" Jimmy Carter, a superdelegate, has endorsed Obama ."]
(CNN) - Former President Jimmy Carter, in a widely expected move, will endorse Barack Obama's presidential bid later Tuesday or early Wednesday.
Carter, a superdelegate who has frequently spoken favorably about Obama, told Britain’s Sky News last month that while he had not yet announced his decision publicly, after the last Democratic primary June 3, it would be time for Hillary Clinton to “give it up.”
He also said that Clinton “had a perfect right” to keep running – but that “a lot of the superdelegates will make a decision quite, announced quite rapidly, after the final primary on June 3."
The former president also told an interviewer last month that he believes Hillary Clinton would accept the vice presidential spot on the ticket, but that he did not believe such an offer would be made by Obama "because I don't see how it would help his ticket. I think he needs somebody like a [former Georgia Sen.] Sam Nunn, but I won't name others.”
Nunn, the former Georgia senator, is known for his foreign policy and national security expertise.