This is just my opinion from watching hours of MSNBC convention coverage, but there are quite a few examples that I remember of MSNBCers seeming to tire of Keith Olbermann, especially Tom Brokaw. Here’s an exchange from Tuesday (Chris Matthews had just called McCain and Palin, much to Oblermann’s annoyance, “Teddy Roosevelt” types) that I thought illustrates this:

OLBERMANN: All right. Chris, let me bring in NBC News special correspondent Tom Brokaw. And the reference to Teddy Roosevelt notwithstanding, Tom has been doing this for a long time, but not quite that long. But I‘d love your perspective on this. This idea that Chris just mentioned that really maybe the major story for the Republicans, at least from their perspective here is rolling out a new product, to use somebody‘s phrase, in September, getting it started with a sense of newness, is that working for them? Is that in fact what this is about? TOM BROKAW, NBC SPECIAL CORRESPONDENT: We don‘t know whether it‘s working for them yet or not. But, Keith, I always have to remind everyone that for the past 20 months, while we have been paying such careful minute attention to every semicolon in these campaigns, these conventions really are about reintroducing the candidates to the broader American public. The Democrats had that charge last week. That‘s why they had that very carefully and theatrically orchestrated appearance by Senator Barack Obama in a football stadium on Thursday night. And in some ways, the Republicans caught a break this week, because tonight, Senator McCain will be sketched first of all by Joe Lieberman and by Fred Thompson in friendly terms.And then we‘ll hear a brief speech from the president at the White House, live, as he‘s introduced by what may be the most popular Republican woman in America today, Sarah Palin notwithstanding, that is first Lady Laura Bush. I think it‘s also worth remembering the essential character of John McCain. Twenty months ago, he was the odds-on favorite to be the nominee of the party. And then, as we all remember, his campaign came apart. He ran out of money. He was taking commercial flights and taxi cabs to fund-raising appearances. And we all said, and so did his admirers within the party, that he was toast. But he fought his way back. I have been thinking about him today and I think probably the most apt metaphor for this old Navy aviator, is that he is a pilot of the old school. He doesn‘t like flying in formation. He flies dogfights as they did in World War II, Pappy Boyington and Joe Foss. And John McCain likes to engage in that kind of combat. And that‘s what we see here, tonight. It‘s very improvisational and it could work, just like the selection of Sarah Palin appeared to be more improvisational than well thought out. When it comes to Sarah Palin, on the floor the guess is that she will get an enormous reaction when she first appears. She is a fuse that has been lit. The question is, does she explode in popularity or does she explode in the candidate‘s face? That is still to be determined. At any rate, politics always give us something new to talk about every nanosecond. Tonight is one more example, Keith, after this entire convention schedule was rearranged by Hurricane Gustav and the political conditions that exist in the land today. OLBERMANN: I‘m not going to try to compete with your analogy, but let me follow up with it in terms of the pilots here. If that‘s the John McCain approach here, what is the logic behind his selection of wingmen tonight with essentially Rudy Giuliani being grounded—all right, I‘ll stop now, Fred Thompson taking Mr. Giuliani‘s place?