Based on what we know so far, FBI Director James Comey’s bombshell letter is likely to lead to very little. Having upended the election campaign with just days to go, Comey owes it to the public to tell us exactly what the FBI knows as soon as possible.

Here’s what we seem to know: Clinton and her top aide, Huma Abedin, exchanged emails (now, there’s a big surprise, eh?). Some of those ended up on devices used by Abedin’s estranged husband, Anthony Weiner, because they shared a computer.

It is already well established that Clinton used a private email account for her official business, that she showed bad judgment in doing so, but that she did not commit a crime. Somewhere between many and all of the newly discovered emails may be duplicates that the FBI has already looked at.

There is nothing new here—just more evidence of what a mistake Clinton made in not using her State Department email account. For one thing, sensitive emails can end up in the hands of someone like Weiner.

Update: Jane Mayer of the New Yorker weighs in with essential reading on Comey’s decision to go public.

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