Current TV, the progressive cable network founded by Al Gore and Joel Hyatt, announced minutes ago that it has fired Keith Olbermann, its best-known personality and chief news officer. As is often the case when media companies decide to part ways with a host, Olbermann’s dismissal is effective immediately – he won’t be given a chance to sign off or host a farewell show. Current’s cofounders published a letter to viewers announcing their decision. To the Viewers of Current: We created Current to give voice to those Americans who refuse to rely on corporate-controlled media and are seeking an authentic...