Virginia I'd say, if Virginia isn't called within 1 hour you will know something has gone terribly wrong for Clinton
If they don't call Virginia at closing, then as usual it will take awhile to call the state because of how long NoVA takes to report.
If the state is called at closing, Trump fans will be complaining on Twitter for the first 2-3 hours after poll closing that "Trump is winning Virginia but the rigged media called the state anyway
"
In any case, Virginia is the clear answer to the poll question.