
I’m not staying up after 9pm PST. If it ain’t known by then, it can wait until morning.
1. Some states count sloooooowly

2. Random glitches cause delays

3. Runoffs may be required

4. Provisional ballots could come into play

5. Someone can demand a recount

6. Lawyers could get involved

All of these scenarios cause heartburn for elections officials who’d much prefer smooth-running contests with clear winners whose victory speeches are finished by bedtime.
“The election administrator’s prayer,” Chapin said, “is, ‘Let the margins be wide.’”
Details @ The Washington Post Election 2018 Analysis