captioning sponsored by cbs >> mason: the cabin in the woods. ehis is the headquarters of the c o-person electric company given a massive contract to bring power to more than three million puerto ricans. how did that happen? >> the federal government has nothing to do with this contract. >> mason: also tonight, a member oo congress says, "me, too." >> congress has been a breeding ground for a hostile work environment for far too long. >> did you kill the president? >> no, i have not been charged with that. >> mason: what the just-released j.f.k. files reveal about lee harvey oswald. and steve hartman takes us back half a century to the beginning of the road. >> humiliated by a 104-year-old man.