I'm sure you all saw the story that State won't be releasing some of Clinton's emails, even redacted, because no amount of redaction would make it safe to release the information. That's a big, bad-sounding story, but it's not the worst story for her today.
The worst story for her today is that the State Department itself declared 22 of her email threads to be Top Secret.
The reason it's much worse is that the determination that her emails couldn't be released redacted came from the intelligence community, and the IC has already given a sworn statement to its Inspector General that her emails contained Top Secret and Special Access Program information. Until today, though, State has held that there was no genuinely Top Secret information included. State's position has been that the IC was overclassifying the information it found in her emails, and that the worst she was guilty of exposing was Secret information.
The Clinton camp could thus claim that this was all a bureaucratic, interagency dispute. One determination is just as valid as another! The IC must be pursuing a vendetta against her, some vast-right-wing-conspiracy type of thing.
John Kerry is Secretary of State. There is no right wing conspiracy vast enough to include him. If his office is saying she passed Top Secret information in the clear, then she can't attribute the charge to partisanship.
Furthermore, this eliminates the dispute between the IC and State on whether or not she insisted on a system in which Top Secret information was passed on an unsecure server. The Federal government now has a unified position: she did.
Now the only question that matters is what they are going to do about it.