“Saturday Night Live,” NBC’s occasionally amusing sketch comedy show, was a gold mine for comedy this past weekend: Alaska’s two Dan Sullivans warping the midterm elections. President Donald Trump’s recent fixation on male backsides. Drunk Uncle’s return. Even a kinder and gentler but still creepy Pennywise the clown. Yet one performer on the long-running show couldn’t resist reaching for a comedic libel that set jaws on the floor on Halloween. Michael Che, co-anchor of the “Weekend Update” faux news segment, quipped: “This week, a record number of people voted in Israel’s election, which is great to see regardless of if...