It's easy enough to see why political opponents might try to make a big issue of it - anything goes in political campaigning.

Apart that is from the occasional genuinely honest one - it was striking that, at the height of battling with Hillary for the nomination, Bernie Sanders said he was sick and tired of this stuff about Hillary's emails. "Let's go to the major issues that are facing America."

What's puzzling is why this non-issue should have got any more serious traction than nonsense conspiracy stuff did.