MADISON, Wis. (AP) — After shattering early voting records, Wisconsin voters had a final chance Tuesday to cast ballots in schools, libraries, churches and community buildings, even as coronavirus cases surged and political tensions were high in the battleground state.

Meagan Wolfe, Wisconsin’s top elections official, said early Tuesday morning that nobody had reported any issues regarding poll openings as voting began at 7 a.m. Central time.

“I really expect today to be a smooth day,” Wolfe said. “I expect voters to have a good, safe experience at the polls.”

Both sides were closely watching absentee and in-person voting for any irregularities that could make the difference. Election officials warned that the time needed to process absentee ballots could leave some results unknown into Wednesday, and they urged people to be patient.

“If unofficial results don’t come in until early the next morning, it doesn’t mean something went wrong,” Wolfe cautioned last week. “It means election officials are doing their jobs and making sure every legitimate ballot gets counted.”

President Donald Trump won Wisconsin by fewer than 23,000 votes four years ago. Joe Biden sought to put the state back in the Democratic column, where it was for a generation before 2016.

In the week leading up to the election, both Biden and Trump campaigned in parts of Wisconsin where their base is strong. Polls showed there were few undecided voters, making turning out the vote all the more vital for both sides.

The coronavirus pandemic motivated over 1.9 million voters to mail in their ballots or vote in person before Election Day, far surpassing the early voting turnout in previous presidential elections. Wisconsin had 3.68 million registered voters as of Sunday.

Early voting constituted roughly two-thirds of the total votes cast in 2016, and the large numbers set up the possibility that polling places would be less congested on Tuesday.

Still, election officials prepared for long lines, especially as precautions against the coronavirus meant voters would be asked to keep a 6-foot distance between one another. Wisconsin has seen a steady rise in virus cases since September, breaking records for new cases, deaths and hospitalizations in the days leading up to the election.

About 400 members of the Wisconsin National Guard were activated to work at polls across the state due to worker shortages. That’s far fewer than the 2,400 who helped with the April presidential primary.

As polls opened Tuesday, Wolfe said the state still had 200 to 300 of those Wisconsin National Guard members in reserve to help out if a shortage of workers becomes apparent somewhere.

“They are not there for crowd control,” Wolfe said. “They are not there for any sort of law enforcement capacity. They are poll workers. That has been made very clear to all of our local election officials, that they need to continue to utilize their contingency plans. In the event that there is any type of disturbance at their polling place, our local election officials are ready to contact their local law enforcement and engage that process.”

About 2,400 polling places were to be open statewide, with no significant closures like those seen during the presidential primary in April. In that election, Milwaukee opened just five of its nearly 190 polling sites due in part to a shortage of workers.