The Iowa Caucuses are mere days away, and that means two things. First, it means we all get to say, "the Iowa Caucuses are mere days away." And second, it means that we get to stage the perennial argument over whether Iowa is representative enough of the country at large for it to have such an outsized role in determining the eventual winner of the presidential primary season. Ultimately, there are a lot of reasons we have this argument, but there are also a lot of reasons for why the argument doesn't go anywhere.