Sen. Bernie Sanders (I–Vt.) has rocketed to the top of the Democratic presidential primary field by running on an idea: Democratic socialism, with the economies of Denmark, Norway, and Sweden as models. So what is Sanders' vision of democratic socialism? And what would it mean for the country? To find out, Reason Features Editor Peter Suderman spoke with Jim Pethokoukis. He is the Dewitt Wallace Fellow at the American Enterprise Institute, where he writes and edits the AEIdeas blog.