I have no reason to think Hillary Clinton will actually end up in jail. That said, the merest possibility has to be considered:
Even if she avoids prosecution, the steady drip of bad news seems to be dragging her campaign down to the point where even a clown like Bernie Sanders can beat her. I feel pretty confident that the Democratic Party will not let Sanders win the nomination by default. They will find someone respectable to try to salvage some dignity. Bernie Sanders makes Jeremy Corbyn look like a sober realist so he cannot be allowed to win.
Thinking about it further, I can’t think of a plausible alternative. Joe Biden is the only guy who comes close to being respectable. Fake Indian is not giving up her safe Senate seat to run. There’s no one in the Senate that is famous enough to make it work, unless someone is willing to run just to help the party avoid embarrassment.
That leaves governors and there are a few who could be thrown to the wolves as they are nearing the end of their careers. Mark Dayton from Minnesota comes to mind. He hates Americans and has nothing else going on. Jerry Brown would be entertaining, but he’s basically Bernie Sanders with an interesting life.
I just hope nobody thinks of Terry McAuliffe.