Conservative radio host Mark Levin will be away from his microphone in coming days – by circumstance, not by choice. Levin said Monday he had a “very bad” fall over the weekend and tore his quadricep, a group of muscles at the front of the thighs, and his right knee. Surgery is now required before he can return to his on-air duties. Levin used social media to break the news, saying: Unfortunately, I had a very bad fall this weekend and tore my quadricep between my right knee and thigh. I’ll likely be in surgery in the next day or...