What is your take on Keith Olberman?

He's a smart guy, and until about a year ago he was a very important and credible voice. Then he became a strange combination of power mad and self-important. He took it upon himself to counter the bias of Fox News by shutting out any and all criticism of the left and he became a piariah at his own network by forcing people out and trying to remake the network in his own image. It's sad because he was very close to being a great anchor, now it looks like he's blown it. What's worse is the questions about his credibility taint his support for Barack Obama, who happens to be a very good candidate on his own merit.