It's not just people who are dead. Probably a bigger problem is people who just moved out of the State, or maybe even just to a different voting precinct. My daughter moved out of NJ back in 2003 or so. Her name changed in 2005. Every time I go to vote, usually twice a year, I see her (old) name in the registration book and I tell the folks there that she should be removed from the rolls. They always thank me and tell me that they will leave a note to whomever directing that she be deleted. But she was still there in November 2010. We don't require IDs here either.
ML/NJ