10:06 p.m. | Updated For nearly a year now, Al Gore and Joel Hyatt have been building their liberal cable news channel, Current TV, with the mercurial television anchorman Keith Olbermann at its center. This week, the center collapsed. Current said on Friday afternoon that it had fired Mr. Olbermann — one of the nation’s most prominent progressive speakers — just a year into his five-year, $50 million contract. It was the culmination of months of murky disputes between Mr. Olbermann and the channel that he was supposed to save from the throes of ratings oblivion. Yet as inevitable as...