If you were a fashion photographer back in the 1990s, you may have known what a superdel was: a high-priced “supermodel,” the word clipped to superdel by fashionistas. That meaning has since been overwhelmed by a usage booming through the U.S. political world: superdelegates, who may or may not decide the next Democratic nominee for president. But that 14-letter word is too long for newspaper headlines, and five syllables is too many for fast-talking heads on telecasts, podcasts, Webcasts or IMcasts. Result: the name of the graying gang of glitterati on whom the multimedia spotlight now shines has been shortened...