Did anyone really think that the Comey thing would change the race? The only people who still care about Hillary's emails are 110% behind Trump.
I believe there was, and still is, an anti-Clinton effect from the story, but also an equally strong pro-Clinton effect resulting from the shift of the story towards Comey himself.
We can credit the pro-Clinton effect to the quick and wise maneuvering by the Clinton campaign, including Clinton herself.
For this reason, I think there is no need to worry about the story dragging on, as the effect of the story basically cancels itself out.
