What is the historical precedent for a president stepping down?

The transcript discusses President Biden's decision to remain in the presidential race, drawing parallels with President Lyndon B. Johnson's withdrawal in 1968. Historian Kevin Boyle highlights the crises faced by both presidents, suggesting Biden faces a more existential threat to democracy. The discussion explores potential outcomes if Biden were to withdraw, including the possibility of an open Democratic convention. The conversation emphasizes the personal and courageous nature of such a decision for Biden, considering his long political career and the challenges of aging.

How does Kevin Boyle describe the potential outcome of an open Democratic National Convention if Biden were to withdraw?

What factors does Kevin Boyle mention that would not be sufficient for Biden to withdraw from the race?

What does Kevin Boyle suggest would be necessary for Biden to come to the decision to withdraw from the race?