It’s pretty unlikely to get two more terms of a democratic presidency. Biden wasn’t VP when he won. The last VP to be elected was Bush 1. Before him, LBJ, special circumstances. Truman, also special circumstances. That takes us back nearly 100 years.
Maybe if Kamala were to step aside we could get a governor as the nominee, but that seems unlikely even though governors have better records in presidential elections. Biden didn’t run when he was VP, but I don’t remember another VP that stepped away from the ticket voluntarily.