maybe bad ratings?

NEW YORK – MSNBC host Keith Olbermann announced Friday that he is leaving the network and has taped his last "Countdown" show.
MSNBC issued a statement that it had ended its contract with the controversial host, with no further explanation. Olbermann hosted the network's most popular show, but his combative liberal opinions often made him a target of critics.
Olbermann did not explain why he was leaving.