Orange County Supervisors District 1 special election

Republican Andrew Do leads Democrat Lou Correa by 2 votes in last night's Orange County on the Board of Supervisors special that was triggered when Janet Nguyen was elected to the state senate. I'm concluding from what I'm reading that this is a first past the post election. State elections have a run off if a candidate doesn't get 50%+1, but Orange County makes the rules here. There are 4,700 mail-in and 1,264 provisional ballots. They'll start counting those Thursday. There's a new law that allows mail-in ballots postmarked by Election Day, and arriving before Friday, to count. If Correa wins he'll be the only Democrat on the Orange County Board of Supervisors. He won a seat in 2004 and is the only Democrat to serve since 1987.