Yes, all candidates for all parties run in the primary which is on election day in November, if no one gets over 50% then the top 2 go to the December runoff.
Some time ago they abolished it for federal elections but swiftly reinstated it. I hate it. And it’s what elected this RINO in the special elections, democrats joined with a few idiots on our side.
If we had that policy elsewhere we could have defeated Franken and Mcauliffe to name two. That helps eliminate the libertarian/reform-style third party spoiler which is really the more frequent scenario in recent years.
Simply running off the top two in a multi-candidate election isn’t the best runoff system, but it’s fine in a 3-person race.