(Search showed nothing) It's fun to be a mob leader until the mob turns on you, as Nancy Pelosi is finding out. A socialist challenger is gunning for her San Francisco district and got #PelosiMustGo to trend on Twitter all day Sunday. Trending on Twitter is a big deal when you're trying to influence the Left's low-information voters. Pelosi's opponent, Shahid Buttar, is a left-wing activist, lawyer, DJ and poet. Among other impressive things, Buttar boasts about his trips to Burning Man, his "socially conscious music" and "outdoor poetry" jams. Buttar finished second in the primary and represents Pelosi's first...