I would guess NJ-5 as the most Republican and NJ-13 as most Democratic but I'm not sure
NJ-10 is definitely more Democratic than NJ-13.
NJ-10 was 82.7% Kerry. NJ-11 was 57.6% Bush. (NJ-05 was 57.3% Bush.)
The Republicans hold three very marginal seats in NJ (NJ-02, NJ-03 and NJ-07), but the least Democratic Democrat-held district, NJ-12, was 54.5% for Kerry. (Thus the very slight 7-6 Democratic seat advantage.) The 2001 redistricting was billed as nonpartisan but was very much a Republican-favoring gerrymander.
