This is a district that has seen a lot of new voters come in/old voters come out, so certainly possible Sires' name recognition has gone down. In primaries where everybody has low name rec, having the ballot in front of you for weeks does give voters plenty of time to become familiar with all of the candidates on their own terms.
Still, as I mentioned in another thread, I'll believe an NJ primary challenger winning when I see it. Sires is, by far, the worst of the NJ Dems in totally safe seats, so nice to see him getting at least a small scare.
What’s wrong with Sires?