You know who should have a radio talk show? Bill Clinton. Or, better yet, Bill and Hillary. They could trade off weeks so they both have time for whatever other good works they want to engage in. I'll bet they could attract a bigger audience than Rush. And who wouldn't want to be a guest on their show? They'd attract an all-star roster without even trying.
Given their popularity and ability to explain things in language that ordinary people can relate to, this could be a bigger contribution to selling the liberal project than anything currently in existence. They should do it.