Steve Kornacki: The geographic dividing lines shaping New Jersey's primary Rep. Mikie Sherrill enters the Democratic contest for governor with several key advantages, but uncertainty looms.

A map projecting a 6-foot sea level rise in New Jersey. Such a rise could submerge parts of the Jersey Shore and the state's barrier islands. NOAA ...

Steve Kornacki: The geographic dividing lines shaping New Jersey's primary Rep. Mikie Sherrill enters the Democratic contest for governor with several key advantages, but uncertainty looms.

Steve Kornacki: The geographic dividing lines shaping New Jersey's primary Rep. Mikie Sherrill enters the Democratic contest for governor with several key advantages, but uncertainty looms.

Steve Kornacki: The geographic dividing lines shaping New Jersey's primary Rep. Mikie Sherrill enters the Democratic contest for governor with several key advantages, but uncertainty looms.