That's correct. It's technically a non-partisan race, though the parties make it perfectly clear who they support.
That being said, it's extremely difficult to unseat a sitting judge in races like these. They either have to do something incredibly stupid that gets their name known to the public in a negative way (I mean, what % of people in any state could name any of their state supreme court justices? 10%? That's probably high), or there has to be a strong will to buck the system for one reason or another, and that's what's going on in Wisconsin right now.
QFT. That's the same everywhere in this country. Incumbency is a huge advantage in such races.
So we have Repubs running scared in Wisconsin, as they should be, and our usual Righties trying to spin it some other way, up to and including pre-emptive attacks of fraud.
In their minds, it must be fraud if they're losing, obviously, because they're oh so right, they just know it...
From what I can tell, Ozaukee county is heavily republican, so I rather doubt they're poorly represented at the polling places or during the vote counting, either...
Spidey's source fairly reeks of empty innuendo and conspiracy theory, unsurprisingly...