The Virtual Candidate by Ryan Lizza will appear in the May 4 issue of the New Yorker, later this week. Its subtitle is “Elizabeth Warren isn’t running, but she’s Hillary Clinton’s biggest Democratic threat.” Senator Warren (D-Mass.) is a former Harvard Law professor and bankruptcy specialist, and a rock star for progressives. She’s adamant about not being a candidate in 2016. I take her at her word, but also think efforts to push the likely candidate for Democrats leftward will only benefit that candidate. So, go Senator Warren! (Senator Bernie Sanders (I-Vt.) will begin his campaign for the Democratic Party nomination on Thursday. Senator Sanders is a 73-year-old Jewish Socialist, who would be 75 if he was inaugurated on January