In her two years hosting “The Argument,” Jane Coaston has changed her mind about many things — from court packing to police reform (though not on whether we should contact alien life). But this year, she has changed her political party; once a proud card-carrying member of the Libertarian Party, Jane is now a registered independent. And she isn’t alone: Kyrsten Sinema, former Democrat of Arizona, just became an independent, and we heard from many listeners of “The Argument” with their own experiences of why they switched their political party affiliations. Now wading in new political waters, Jane really wants to know: What happens when your party leaves you behind? In the final episode of “The Argument,” Jane calls on former congressman Justin Amash of Michigan to help answer that question. While in office, Amash changed his party affiliation from Republican to independent, and then to Libertarian, which made him the first sitting Libertarian Party member in Congress. The two share strong opinions about what the Libertarian Party stands for today and discuss how political parties — whether big or small — should amass power. Mentioned in this episode: Elizabeth Nolan Brown’s work at Reason.com Jane’s 2016 interview with then-candidate Gary Johnson (A full transcript of the episode will be available midday on the Times website.)