The internet has been all abuzz since Keith Olbermann's surprise announcement that Friday would be his last appearance on MSNBC's “Countdown.” Over at the liberal website Salon, Steve Kornacki wondered, ” Is Olbermann the victim of his own success? “: MSNBC, for its part, embraced the identity Olbermann was offering them. By 2008, his frequent guest, Rachel Maddow, was given her own show at 9 p.m. And liberal radio host Ed Schultz was given his own shortly after that. Lawrence O’Donnell, another left-of-center voice, was added just a few months ago. Eventually, the network adopted a new motto — “Lean forward” — that’s about as subtle as Fox’s “fair and balanced” pledge. MSNBC’s prime-time lineup is now awash in progressive politics. Of course, now that he’s surrounded by similar voices, Olbermann isn’t nearly as essential to MSNBC’s brand, which surely has something to do with his abrupt departure on Friday night…Now that they’ve built a loyal prime-time audience of left-leaning viewers, NBC’s executives may simply feel that they can afford to be rid of Olbermann and all of the headaches he brings with him. It used to be that he was the only reason liberals turned on their channel at night. Now he’s one of many reasons — a victim of his own success, in other words. Hot Air's Ed Morrissey doesn't agree : Other than Maddow, whom Olbermann most certainly discovered and nurtured into a parallel show, the other people in the lineup had careers in broadcasting before Olbermann.