MSNBC apparently thought that Keith Olbermann and Chris Matthews hosting campaign coverage was too interesting, and too "liberal" so they have yanked the two and replace them with the dull David Gregory.
Those guys made the conventions watchable. I love the whole merry quarreling band of folks at MSNBC. There are at least 5 networks out there if you want dull balance (Big 3, PBS, CNN) one choice if you want conservative and interesting (Fox). MSNBC was this close to being liberal and interesting. Guest they just want to be the same.