By Roger Kimball At some point in this column, I have probably had occasion to quote these famous lines from Walter Scott’s poem “Marmion”: “Oh, what a tangled web we weave When first we practice to deceive.” In another, better world, I like to think, the Bidens and their protectors and puppet masters would ruefully be contemplating Scott’s admonitory observation. In this world, however, I suspect that—until quite recently, anyway—they had smugly sided with J.R. Pope’s sly amendment to Scott’s moralizing couplet: “But when we’ve practiced for a while How vastly we…