You thought we were done with him, didn't you. What's Scott Brown been up to since his forced retirement by Sen. Elizabeth Warren? What else? Tweeting. And maybe taking some lessons from Chuck Grassley on the art of the tweet. The ex-Sen. and maybe soon-to-be-candidate Scott Brown was in fine form, with a gibberish-filled Twitter spat on Saturday night, mostly consisting of the biting comeback, "whatever." Or in what was soon to become the trending hashtag of the weekend: Brown's cooler, or clearer, or maybe less-inebriated head prevailed Sunday, when he deleted that evidence temporary lapse in judgement.