(Washington, DC) Medical authorities have failed to explain why MSNBC’s Chris Matthews’s leg hasn’t stopped tingling since the evening hours of February 13 during an acceptance speech given by Democratic candidate Barack Obama. Matthews first reported his condition in an on-air exchange with Keith Olberman about an hour after Obama swept the so-called Potomac primaries in Virginia, Maryland and DC. According to MSNBC transcripts: “I have to tell you, you know, it’s part of reporting this case, this election, the feeling most people get when they hear Barack Obama’s speech. My, I felt this thrill going up my leg. I...