On tonight’s Countdown, Keith Olbermann described himself as an . . . “a-hole.” He made the admission in the context of describing the various shows in the MSNBC line-up on the occasion of announcing that Ed Schultz will be joining the network’s, um, stable. KEITH OLBERMANN: Alright, you’ve got the conundrum all of us have as this thing gets more and more successful. The show’s got to look like a relative of all the other shows right before it and right after it. But not too much. I mean, Chris is the political inside-baseball guy. Rachel is the affable, charming policy wonk. I’m the a-hole. What are you going to be?