Saltier Politics does a 'Best of' with MSNBC host and author of 'The Red and the Blue: The 1990s and the Birth of Political Tribalism' Steve Kornacki. Listen as he gets salty with co-hosts Julie Roginsky and Emily DeCiccio, and explains how politics in the United States became so tribal. Hint: it wasn't Twitter. Join the politically savvy trio and don't forget to bring your saltshaker!