Keith Olbermann's friends and family may want to check on him after a particularly troubling Twitter meltdown. The corybantic ravings and fanatical delusions displayed in his tweets are cause for alarm. His particular frantic symptoms are familiar to anyone who has read Old Yeller. Agitation, salivation, foaming at the mouth, confusion, hallucination, and extreme anxiety are sure signs of a rabies infection -- and Olbermann appears to be in the late stages. The confusion stage of the disease started with this tweet about Trump not declaring the flooding in Texas a national disaster fast enough, even though a president must...