Nonsense, Hillary has not been indicted so, no jeopardy rules apply.
I didn't say anything about jeopardy. I noted the process that leads to prosecution. A lot of the time a charge dies on the vine, if the prosecutor finds insufficient evidence to successfully prosecute, or some other compelling reason relating to the potential charge. That's what happened here. You want a process that goes deeper into that, which would come, you hope, with a regime change. And that's why it's political in nature.
How often do cases get reopened with a fresh set of eyes?
Not very often absent new evidence.
I would venture to say it happens enough to be notable
Anything that can be quantified is notable.
all the more reason to hand over all the evidence to a grand jury and let them decide if anything is indictable or not instead of political figures on either side making the determination which makes the entire affair political matter instead of a legal matter
I can understand the impulse, but if this had gone to a GJ and they'd taken the same course I'd have bet, dollars to doughnuts, the cry would be, "Sure, but look who impaneled the jury." Or, either you believe in the process or your find reason not to. GJs are prosecutor's shows. They tend to advance cases they feel confident can lead to conviction and the standard for a GJ is much lower than it would be at trial, which largely assures a prosecutor of getting his bill.