So East Rutherford is slightly less well off, but it's not exactly something you'd fear turning into. Why it's more Republican is interesting though.
Whites feeling more threatened, ie the Yonkers Effect?
Possibly, but that crime rate is nothing notable. Hell, it's basically a statistical tie with Bismarck's.
Side note: Interestingly the two largest cities in ND, Bismarck and Fargo, both are in the top 10 crime increase from 2005-2006 among cities with over 50k. My parents say it's not even that uncommon to see people in gang colors now and the city is now issuing bulletins basically saying the days of leaving your doors unlocked when you go out for the night are over. Place sure has changed since when I lived there...