Obama should negotiate his resignation now to avoid impeachment later. He and family can get one last flight on Air Force One to Hawaii where he can live in enjoyable exile rather than prison. I hope he spares us and himself the pain of impeachment.
No, I would rather have it all: the impeachment, followed by the criminal trials, and then prison time. But, if we have to, I would take resignation (with no "out" on criminal charges), followed by criminal trials, and mucho prison time.