Back in the 1990's, he was a very good sports reporter, and I'd actually regularly watch his show on CNN / SI's channel.
It wasn't until MSNBC gave him what he believed was a position of power, is when he immersed himself into the cesspool of left wing madness.
The funny thing is that for all of its hard left leanings, MSNBC fired him for being too much of a left wing whackjob.
I actually believe that he simply got drunk on what he thought was power, and never came down from that high.