A league source tells us that the Jets have fired coach Eric Mangini. The move will be announced at a 10:00 a.m. EST press conference. Wow. (As of 9:15 a.m. EST, the termination of Mangini has been confirmed by ESPN 1050 in New York, Jay Glazer of FOX, and Adam Schefter of NFL Network. Per Glazer, owner Woody Johnson was “visibly upset and agitated” after Sunday’s loss to the Dolphins.) And so it becomes clear that Mangini has taken the fall for a season of unfulfilled expectations after G.M. Mike Tannenbaum broke from the concept of building through the draft and rounded up a bunch of high-priced veterans. At the press conference, it’ll be interesting to see what if anything Johnson says regarding his comments from March 2008, during which he declared that Mangini and Tannenbaum “absolutely” would be back in 2009. “I really think it takes time to build,” Johnson said. “You can’t do it in one season.” We’ll have more to say about this one after the press conference.