Suppose there are two political parties, the Blues and the Reds, each pursuing a demographic strategy to maximize its vote: “targeting” voters exclusively by race and sex. To make it simple, there are two racial categories, “white” and “minority.” Imagine that no other demographic features are relevant, 100% of the electorate turns out, and everyone votes as the parties want them to: The Blues get all the female and minority votes; the Reds get all the white and all the male votes. Your imagination runs out right there.

Source: Wall Street Journal March 21, 2018 22:30 UTC