What is the strategy of the Biden 2020 campaign?

Very simple, Joseph Biden, if elected, most likely will step down soon after he is elected so that his vice president pick becomes the next president of the U.S. 

I would not be surprised at all if Joseph Biden and his vice president would have an explicit agreement about that!

There is little doubt that his mental faculties and his physical health are not the very best! Has Joseph Biden provided any current medical records of his health recently? He could even die in office!

That is also why his choice for vice president is most likely the most consequential in U.S. history!