Fair points on the various reasons for potential voter apathy- but I still don't understand the initial assertion as to how a race being tight could possibly lead to a lack of excitement.

That's a bit like saying Rocky would have been a more exciting film if they'd said "Oh yes, no doubt about it, Rocky will win" & the fight was then over after a one-punch knockout...
I wasn't trying to make that assertion, but I realize that I misread the Reuters headline which reads "Close race makes up for waning zeal in expat vote". I missed the word "up" which totally reverses the sentence. I'll fix that. Thanks!
Ah, ok- that makes slightly more sense-

Just out of interest, is there any way one can change the state in which one is registered to vote? Or is it simply a case of you being registered in whatever your last registered state in the US was? (and if so, how long would you have to be back there in another state before you could be registered there?)

On a different note- I was just wondering, is this the first presidential election in which neither candidate served in the military?
No, you can't change the state in which you're registered to vote. I wish I could, but having never lived in a swing state, my vote would never really matter.

As for residency time, that varies from state to state. Just glancing around online, I see that it takes a year to be a New York resident, but only proving "intent" to become a Washington (state) resident. Alaska is 30 days for voting and one year for full residency.

And according to this article, this is the first election in 80 years in which neither candidate has served in the military.