I also recall that Hillary herself emailed one of her aides and instructed them to remove classification markings from a document and to send it unsecured. That is pretty convincing evidencing that Hillary intentionally gathered classified information on her UNSECURED server. Had you or I done this, we would already be in a cell awaiting trial.
It's not clear that the document was classified or that Hillary was talking about changing markings on the document itself. It is supposed to have contained some talking points. The State Department claims that the document was eventually sent through a secure channel, not as an email to Hillary's server.
Having all these allegations in the background is not helping Hillary's election chances, but there has to be something more solid for her to have real legal jeopardy.