By Jonathan Bernstein, Bloomberg News (TNS) Back in the days of blogging, there was something called “fisking” — the practice of painstakingly, paragraph by paragraph, examining, critiquing, fact-checking and (since blogs were like that) ridiculing someone’s bad argument. It is possible to fisk a tweet? Because Dan Crenshaw, a Republican member of the House from Texas, is sort of inviting it. Here’s