Whether due to connectivity issues or user error, some polling places had problems with the new voting system. Hotlines are available to help resolve issues.
Nine days of early voting are being held in New Jersey for the first time, from Oct. 23 to Oct. 31. There are between three and 10 sites in each county.
Former President Barack Obama comes to New Jersey one week after first lady Jill Biden for a similar rally to excite Democrats at the start of early voting.
Vote-by-mail ballots have already begun being mailed, and debates begin Sept. 28. The registration deadline is Oct. 12, and early voting starts Oct. 23.
About 690,000 people in New Jersey signed up for permanent vote-by-mail. If they don't opt out by Tuesday, they can't vote early on machines, new this year.
Early, in-person voting is coming to New Jersey this year, but lawmakers are worried if the election system is ready to administer and pay for the change.