Rep. Tom Kean is back in the House after a mysterious 117-day absence during which the New Jersey Republican missed at least 100 votes. He, finally, has provided an explanation as to why he disappeared from his elected office for nearly four months, in what other lawmakers have described as “radio silence.”  “Several months ago, due to health concerns, I entered the hospital for some testing. I did not believe that this would result in a long-term stay [and] I was given the diagnosis of