Now that we know former New Mexico Gov. Gary Johnson is going to be the Libertarian Party nominee after this weekend’s convention, much of the talk has centered around how Johnson could be a spoiler for Donald Trump against Hillary Clinton. Conventional wisdom would say that Libertarians and Republicans have a closer ideology than Libertarians and Democrats, and therefore, conservatives dissatisfied with Trump will vote for Johnson. The problem with this conventional wisdom is that 2016 isn’t conventional, and the candidates representing their parties don’t hold the usual ideologies of their parties. At this point, it appears there are more...