Whenever abortion comes up in a political context, pro-choice advocates highlight pro-life candidates' refusal to support a "rape and incest exception" to any proposed ban on, or regulation of, abortion. The 2016 presidential campaign is no exception. Recently CNN anchor Dana Bash handed the hot potato to former Arkansas governor Mike Huckabee. Huckabee's response: "A 10-year-old girl being raped is horrible. But does it solve a problem by taking the life of an innocent child? And that's really the issue."

Pro-choice publications predictably erupted, painting Huckabee as cold-hearted for his position. But that position flows inexorably from the logic of his larger pro-life stance, and is in fact a libertarian argument.

Notice that I said "a" libertarian argument, not "the" libertarian argument.