Nearly a week after the disastrous presidential debate, more Democrats are going on the record to suggest President Biden step aside and let another candidate be the nominee for president in 2024. After prominent Democrats called questions about Biden’s mental acuity “valid,” a cascade of other voices echoed the sentiment. But that introduces a potentially more complicated question: if not Biden, who? Playbook co-authors Rachael Bade and Eugene Daniels take stock of the Democratic disarray.