Dave Chappelle is tonight’s guest host, and that’s quite a coup for Saturday Night Live – as is the landing of the week’s long-dormant musical act, A Tribe Called Quest. But even they will be overshadowed by this week’s opening sketch, in which, undoubtedly, Alec Baldwin and Kate McKinnon will take the stage as Donald Trump and Hillary Clinton. And did the former star of 30 Rock ever dream, when he signed on to impersonate the former star of The Apprentice, that he was heading for at least a four-year extended gig?