Mitch McConnell, the longest-serving Senate leader in history, announced that he won't seek re-election next year, bringing an end to his four-decade career in the chamber. Former RNC Chair Michael Stelee joins MSNBC’s Ari Melber. (The Beat's YouTube playlist: msnbc.com/ari Ari: / arimelber Beat merch: msnbc.com/Beat5) For more context and news coverage of the most important stories of our day click here: msnbc.com » Subscribe to MSNBC: youtube.com/msnbc » Subscribe to MSNBC on TikTok tiktok.com/@msnbc » Subscribe to MSNBC on Instagram instagram.com/msnbc Download our new MSNBC app for the latest breaking news and daily headlines at a glance: msnbc.com/information/download-msnbc-app-n1241692 Follow MSNBC Show Blogs MaddowBlog: msnbc.com/maddowblog ReidOut Blog: msnbc.com/reidoutblog MSNBC delivers breaking news, in-depth analysis of politics headlines, as well as commentary and infor...