Greg Sargent gets a comment from Jay Carney, Vice President Biden's communications director, about a new book's claims that Biden and President Obama had a strained relationship:

We aren't going to comment on rehashed rumors about the campaign. But I can say that if the authors were concerned with accuracy they might have checked their reporting with people on the Vice President's staff. They did not. I can also say that the President and Vice President have worked together very closely and successfully this past year.

It's worth keeping in mind that the book in question is co-authored by Mark Halperin, an editor-at-large at Time magazine -- where he worked with Carney, who served as Time's Washington bureau chief before going to work for Biden.

Also worth keeping in mind: concern for accuracy is not among Halperin's strong points:

Halperin says (repeatedly) that President Obama was the one who failed to seek bipartisan agreement. That is the exact opposite of what happened. This is not a matter of interpretation; it is a matter of clear facts. The Republican proposal consisted entirely of tax cuts. That happened. It's a fact. The Democratic stimulus package included a mix of tax cuts and spending. That happened. It's a fact. When Mark Halperin says it was Obama and the Democrats who refused to seek bipartisan agreement, he is demonstrating that he is either so woefully uninformed about basic facts or so blatantly dishonest that, in either case, he cannot be taken seriously.