Samantha Power is currently in the UK, promoting her new book. Somehow I don't think this is quite the sort of message the Obama campaign is likely to find especially helpful:
Ms Power told The Scotsman Mrs Clinton was stopping at nothing to try to seize the lead from Mr Obama.
"We f***** up in Ohio," she admitted. "In Ohio, they are obsessed and Hillary is going to town on it, because she knows Ohio's the only place they can win.
"She is a monster, too – that is off the record* – she is stooping to anything," Ms Power said, hastily trying to withdraw her remark...
"Interestingly, the people in her innermost circle seem to not mind her; I think they really love her."
But she added: "There is this middle circle – they are really on the warpath. But the truth is she has proved herself really willing to stoop."
In recent TV appearances Mrs Clinton had looked desperate and on the back foot.
Ms Power agreed, and said: "Here [ie, in the UK], it looks like desperation. I hope it looks like desperation there too.
"You just look at her and think: ergh. But if you are poor and she is telling you some story about how Obama is going to take your job away, maybe it will be more effective. The amount of deceit she has put forward is really unattractive."
*The paper says Power's interview was understood to be on the record - and not on background - since she was promoting her book. Gerri Peev's a good reporter too, so I don't for a second doubt the accuracy of the quotes.
UPDATE: Jake Tapper reports this statement from Samantha Power:
These comments do not reflect my feelings about Sen. Clinton, whose leadership and public service I have long admired. I should not have made these comments and I deeply regret them. It is wrong for anyone to pursue this campaign in such negative and personal terms. I apologize to Sen. Clinton and to Sen. Obama, who has made very clear that these kinds of expressions should have no place in American politics.