Perspectives on Politics isn't exactly a top-drawer journal. It's the sort of outlet where articles (often more on the philosophical side) end up that lack the scientific rigor necessary for the top-tier journals.
Also, FYI, political science has a pretty contentious divide between people who favor a scientific approach and those who prefer a normative/philosophical approach. The two sides basically hate each other. So to claim that "In political science - they assert this is science" pretty much misses half of the story.
Also, FYI, political science has a pretty contentious divide between people who favor a scientific approach and those who prefer a normative/philosophical approach. The two sides basically hate each other. So to claim that "In political science - they assert this is science" pretty much misses half of the story.