There was, of course, the problem that the butterfly ballot in Palm Beach County gave the presidency to Bush, but even accepting/excepting that (see what I did there?), the final tally in Florida gave Bush the state by a margin of 537 votes. Flip a few hundred people, and Gore would have been president. What would the narrative have been?
Maybe it would have been about an October surprise! Maybe it would have been about a late-breaking story about a drunk driving incident from Dubya's past. Anyone remember that? I do. Hey, at least he didn't kill anyone, like Ted Kennedy. Or, maybe just a narrative about the continuation of the 90's economic boom (even though it was over), or people not trusting Bush's intelligence, or something like that.
In a close election, it is easy to construct a narrative around anyone's victory or loss, particularly when there is an October surprise. See where I'm going with this?
Comey gave us an October surprise. The race is close. Comey's announcement, strange though it was, moved the polls more than I expected, although the polls and betting markets overall still favor Clinton by a smaller amount. If Clinton still wins, will we forget about Comey the way some forgot about the Bush drunk driving thing? Not likely, since there will still be another announcement when the FBI reveals what was on the computer, and the Republicans will never stop talking about the emails, but in terms of campaign narratives, it could be easy to forget amid the Trump scandals like pussygate. If Trump wins, though, we will certainly, and perhaps rightly attribute it to Comey. That's an asymmetry, though, and we should be aware of the asymmetry because it is intrinsic to how we construct campaign narratives-- something that I am generally loathe to do.