New Jersey voters are choosing a Republican to challenge Democratic Gov. Jon Corzine in the fall.
Depending on Tuesday's winner, Corzine could face a tough re-election bid come November.
A series of polls has shown Corzine trailing Republican Chris Christie, a former U.S. attorney under President George W. Bush.
But Christie must first thwart challenger Steve Lonegan, a former mayor of Bogota, which is about 15 miles north of Newark. GOP Assemblyman Rick Merkt has trailed both in polls.
Corzine faces token opposition in the Democratic primary. Vice President Joe Biden plans to join Corzine to formally launch his re-election bid after the polls close at 8 p.m.
Check back for more on this developing story.