Done properly, both Bernie and Hillary could be attracted to participate. Asynchronous would be safer – at least in the beginning. Later, some synchronous ZOOM or SKYPE sessions could be organized. It would give them each the opportunity to think about how their post would be perceived and responded to.
There are a great many ways this could be done, including the types of topics. They both would agree to participate only if the platform and moderators were neutral overall. Other selected persons could be invited to participate.
Why isn’t this already being done? Do any political candidates have websites where others can actually dialog with the candidates?
There may be copycat offers to moderate online dialog, once the news gets out. This could include some bigboys with money.
A variation would have some of their contribution video, but still asynchronous. These could later be strung together to make programs for TV or Cable.