My, but Team Hillary is bad at Venn diagrams

FiveThirtyEight’s Ben Casselman put it succinctly on Twitter: “This isn’t remotely how Venn diagrams work.” (His tweet, as of writing, has more retweets than the Clinton campaign’s.)

He’s right. A Venn diagram is meant to show the overlap between two groups of things — ideally, to scale. One problem with the Clinton diagram, for example, is that “gun owners” in this context is a group that exists entirely within the universe of “Americans.” What’s more, if the overlap is meant to be “supports universal background checks,” the overlap should cover 90 percent of the circle of “Americans.” …

Not really the point here. The point here? That diagram was bad, and the Clinton staffer who made it (Bill?) should feel bad.