Biden can use the debate stage to include and invite Bernie and his supporters to unite around the two most popular and desired changes, marijuana and health care.
Biden must thank Bernie for his leadership on ending the marijuana prohibition which has criminalized over 40 million citizens and their families. He must further support total expungment of all marijuana related convictions. This is the only way Biden will gain the support and zeal of the millennials and Bernie Bros.
Secondly, Biden must agree with Bernie that health care for all is the goal and that we need to move towards that goal by building on Obama Care. This will be a big pill to swallow but will be washed down with the pro pot stance.
This is the only way to beat Trump because it is the only way Biden will get any Wiz for the young folk.
Think about it, Admit you were wrong and Win ..