Keith Olberman made a name for himself bashing some of the most powerful and sometimes ridiculous conservatives in power. From George Bush and Dick Cheney, Glenn Beck to Bill O' Reilly, and even Buffalo's Carl Palidino. Some criticism was warranted, some not so much, but Olberman never minced his words.As a result, he became a headache for MSNBC, even being suspended last November for openly donating to campaigns he believed in. Including congresswoman Gabrielle Giffords. But was Olberman's exit voluntary or did it come from  MSNBC management? Nobody's saying for sure. Watch his sign off and read the article from AOL News on Keith Olberman's controversial history at MSNBC

NEW YORK -- Keith Olbermann was MSNBC's most popular personality and single-handedly led its transformation to an outspoken, left-leaning cable news network in prime time. Despite that, he often seemed to be walking on a tightrope with his job. Friday night, it snapped.