From Roll Call:

New Jersey’s gubernatorial primary on Tuesday will set up a general election that will be closely watched as a barometer for how voters are responding to the Trump administration.

Six Democrats are facing off for their party’s nomination to succeed term-limited Democratic Gov. Phil Murphy, while Republicans have a five-way contest to pick their nominee.

The race has already become one of the most expensive nonpresidential primaries in U.S. history, with candidates and outside groups spending more than $122 million combined as of June 6, according to the New Jersey Election Law Enforcement Commission.

But it's complicated.

Just ask MSNBC's Steve Kornacki:

Credible public polling has, overall, been limited and infrequent. And court-imposed changes to the layout of the primary ballot could dramatically dilute the power of the endorsements Sherrill has received from key county Democratic organizations.