New Jersey is possible, especially if the white vote doesn't move away from Clinton, or even moves towards her (and there is evidence of this in the closed primaries that have voted so far).
Here is a map of the 2008 New Jersey Democratic primary:
http://uselectionatlas.org/RESULTS/state.php?fips=34&year=2008&elect=1
Clinton "only" won the state by 10%, mostly because African-Americans in Jersey overwhelmingly opted for Obama instead.
Here is a map of New Jersey's African-American population by county:
http://www.indexmundi.com/facts/united-states/quick-facts/new-jersey/black-population-percentage#map
Obama won 5 counties in New Jersey, 3 of which have a 20%+ African-American population: Essex (41.9%), Union (23.4%) and Mercer (21.1%). He also won Somerset (9.8%) and Hunterdon (only 2.7% - and the closest county in the NJ primary).
It's entirely reasonable to believe Clinton can sweep all of New Jersey's counties in the June 7 closed primary, but assuming she doesn't, the counties she loses will not be the ones she lost in 2008, but will probably come from Southern Jersey. I'm thinking Cape May and Gloucester. But the white vote would have to swing hard against her.