Polls open at 6 a.m. on Tuesday in the New Jersey primary election, when the two major political parties will choose their candidates for president, Senate, Congress and many local offices.

The New Jersey Division of Elections has a voter information portal where state residents can check to make sure they are registered, find their polling places, find drop boxes where they can submit their ballots by mail, and track their mail-in ballots.

Although President Joseph Biden and Donald Trump have already sewn up their respective parties' nominations, New Jersey has some competitive congressional primary races this year. And for the first time in generations, Democratic incumbents and others favored by local party machines won’t be able to rely on help from the state’s “county line” ballot system, which usually gives them preferred placement on the ballot if they secure endorsements from county political committees.

In the primary for the U.S. Senate seat held by Bob Menendez, Democrats will choose among Rep. Andy Kim, Patricia Campos-Medina and Larry Hamm. Republican voters will choose between Curtis Bashaw, Christine Serrano Glassner, Albert Harshaw and Justin Murphy.

Menendez is currently on trial, charged with bribery and corruption. He maintains his innocence and has said he may run as an independent in November if he is acquitted. He has until Tuesday, the same day as the primary, to submit a nominating petition to run as an independent.

All 12 New Jersey members of the House of Representatives are up for reelection. Two — Democrats Rob Menendez and Bill Pascrell — are facing primary challenges. And in the 3rd Congressional District, the seat currently held by Andy Kim is open.

Rob Menendez, the son of the embattled senator, is being challenged by Hoboken Mayor Ravi Bhalla, who saw an opportunity to take on the congressman after his father was indicted in September. The district includes Jersey City, Hoboken, Union City and much of Hudson County. It is the only congressional district in the state with a majority of Latino voters.

In the 9th Congressional District, Pascrell is being challenged by Mohamed Khairullah, the Syrian-born mayor of Prospect Park. Pascrell has served in Congress since his election in 1996 and has rarely faced a competitive race. But the large Middle Eastern communities in his district are organizing against him because he has not opposed Israel’s war in Gaza.

Democrats who want to cast protest votes against Biden can choose “uncommitted” on the ballot. An organization known as Uncommitted NJ is calling on voters to show Biden they want him to stop Israel's bombing of Gaza.

“As primaries have unfolded across the country, tens of thousands of Democratic Primary voters from across the nation have made their voices heard, boasting numbers that show Uncommitted routinely collecting over 10% of Democratic Primary voters in states throughout the country,” said Carissa Cunningham, a member of the group's steering committee.

In most New Jersey counties, Democrats will see a new primary ballot design this primary. That's because Kim successfully sued to block ballots from using the county line system, which puts all the candidates endorsed by a county political committee into a single column or row — regardless of the position they’re running for — and signals their perceived legitimacy to voters.

Instead, the Democratic candidates for any given office will now be grouped together in an “office block,” the ballot design used in all other states. Just two New Jersey counties used office-block layouts before a recent court ruling.

Still, Republican primary ballots were not affected by the ruling, and most will still use county line designs in the election.

By the time polls open on Tuesday, many New Jersey voters will have already voted early. More than 279,000 have submitted mail ballots, according to Ryan Dubicki, who tracks vote totals for the Associated Press. Democrats use mail ballots in far greater numbers, outpacing Republicans by a more than three-to-one ratio.

Early in-person voting took place this week and ended on Sunday. Mail ballots must be delivered to a drop box or postmarked by Tuesday to be counted.