What it takes to replace a candidate: Elaine Karmack explains the rules as Democrats debate Biden’s future

Former President Trump delivered a historically long acceptance speech on Thursday night, and Chuck Todd asks if his energy shift is a sign of things to come. Plus, author and scholar Elaine Karmack explains the byzantine rules and options that a political party has for replacing a candidate, as calls for Joe Biden to step aside as the 2024 Democratic nominee grow louder.