Acosta: “Why can’t you just answer yes or no whether you were in the dark. I think it’s a fairly simple question whether you just didn’t have the information at the time.”
Sanders: “I think it’s a fairly simple answer that I’ve given you several times now. I gave you the best information that I had and I’m gonna continue to do my best to do that every single day.”
In this instance, “the best information I had” is a euphemism for “the President of the United States didn’t tell me the whole truth and then I went out and repeated it.”
To the extent Sanders retained credibility among the White House press corps, she lost it with that answer. Admitting that you misled the press because the President misled you is tantamount to taking your credibility, pouring gasoline on it and then setting it on fire.