As far as October surprises go, this is probably one of the most nuclear:

“In previous congressional testimony, I referred to the fact that the Federal Bureau of Investigation (FBI) had completed its investigation of former Secretary Clinton’s personal email server. Due to recent developments, I am writing to supplement my previous testimony,” Comey wrote.

“In connection with an unrelated case, the FBI has learned of the existence of emails that appear to be pertinent to the investigation. I am writing to inform you that the investigative team briefed me on this yesterday, and I agreed that the FBI should take appropriate investigative steps designed to allow investigators to review these emails to determine whether they contain classified information, as well as to assess their importance to our investigation,” he added.

One thing that might be really interesting to see is if someone’s immunity deal just imploded. That would be amazing because it should open a floodgate of new details

This will not be resolved in time for the election, so it will drag Clinton down, just as the emails about Clinton, Inc shaking down the rich and powerful for personal fortune are dragging her down.

Update: Clinton Tanks Stock Market