Raw Story:

Fox News's Martha MacCallum did a second take of her apology to Rep. John Conyers (D-MI) for mixing him up with indicted Louisiana Democrat William Jefferson in a Monday afternoon broadcast.[..]

The Live Desk host's 30-second apology for confusing Conyers with another African-American lawmaker came after an 8-second clip on Tuesday afternoon in which MacCallum failed to explain the particular error her production team had made.[..]

Fox pinned the error on a young staff member in an Associated Press report Tuesday night.

"Fox blamed the mistake on a 22-year-old production assistant hurriedly grabbing a wrong videotape. Fox's Washington bureau chief, Brian Wilson, said he was mortified by the error," the news service reported.