The Fairleigh Dickinson University-PublicMind poll of likely voters released Friday gives Obama 53 percent to McCain's 35 percent.
The Democrat gets the support of 80 percent of voters under age 30, and 85 percent of those who voted for Hillary Clinton in the Democratic primary.
Two other polls this month also have Obama way ahead in New Jersey.
The latest Monmouth University/Gannett New Jersey Poll has Obama up by 19 points among registered voters. A Quinnipiac University poll has Obama up by 23 points among likely voters.
No Republican presidential candidate has won New Jersey since George H.W. Bush in 1988.
The FDU poll surveyed 852 likely voters Oct. 23-29 and has a sampling error margin of plus or minus 3.5 percentage points.