Murphy campaign spokeswoman Alex Altman described the change as a "transition" and told The New York Times the campaign is still confident of a win in the June Democratic primary over Rep. Andy Kim.
The Fairleigh Dickinson University poll of about 500 likely Democratic voters was billed as the first independent survey of the contested Senate primary.
Tiebreaker chooses Democrats' proposed map. Four of the five competitive districts further favor the incumbent's party, except for the redrawn 7th District.
A bill signed by President Joe Biden includes forgiveness of Community Disaster Loans worth tens of millions of dollars that were awarded to several shore towns impacted by Sandy in 2012.