Spoilers ahead! No, not those type of spoilers. We're talking about third party presidential candidates and the reasons third parties can't get a footing in American politics. So, why do third parties fail? And could the current toxicity of both major American political parties create an opening for a centrist third party? 

GUEST: Michael Cullinane, professor of U.S. History and the Lowman Walton Chair of Theodore Roosevelt Studies at Dickinson State University in North Dakota. He’s also author of the soon-to-be released book: Theodore Roosevelt and the Tennis Cabinet.