More in the cross-post on the MRC's NewsBusters blog.
On her MSNBC show on Thursday, host Andrea Mitchell kept pushing the blatant falsehood that the open letter by Senate Republicans to Iran regarding nuclear negotiations was an "unprecedented" move: "Let's talk about this letter now, because this is unprecedented."
Mitchell touted Secretary of State making a show out lecturing the GOP during a Senate hearing on Wednesday: "John Kerry's outrage was really genuine, this was not a political moment. He went before the committee where he had served for twenty-eight years and said, 'I – when I sat on the other side of the table, I had never done anything like this.'"