Keith Olbermann leaves MSNBC; questions persist

Controversial Countdown hos Keith Olbermann parted ways with MSNBC on Friday night. Although neither the network nor Olbermann publicly cited a reason for his abrupt departure, the relationship ran into trouble in November when MSNBC suspended Olbermann for two days for making campaign contributions to three political candidates, including Rep. Gabrielle Giffords (D-Ariz.), who was severely wounded in a Jan. 8 shooting. His departure fit a pattern that has marked his 32-year career. He has had frequent run-ins with his bosses, most of which resulted in Olbermann leaving a job, including an earlier flameout with MSNBC in 1998. His nearly eight years hosting "Countdown with Keith Olbermann" was by far the longest he's lasted in a job during his career as a broadcaster.