Election 2020 updates: Biden warns of 'dark winter,' pushes masks in pandemic plan

Biden still leads statewide, but in Maricopa County, Arizona, his margin is smaller.

At 9 p.m., Biden was leading Trump 51% - 48% statewide with 1,444,213 votes to the president’s 1,365,040. So far, 86% of the expected absentee vote was in, with 86% overall expected vote in as well.

Arizona's most populous county had about 400,000 votes to process and their most updated release indicated 338,000 are remaining. County officials said they're expecting to release more information at 12:30 a.m. ET/ 10:30 p.m. MT.

In the Senate race, Democrat Mark Kelly still led Sen. Martha McSally 52%-48%. This has narrowed since an earlier update where he led 53%-47%. ABC News has not made a projection this race.

-ABC News’ Meg Cunningham, Allison Pecorin and Jenna Harrison

The Trump campaign has filed a second lawsuit in Pennsylvania. 

This suit, filed in state court and naming Secretary of State Kathy Boockvar and all 67 counties in Pennsylvania, alleges that Boockvar illegally extended a deadline for mail-in voters to supply any missing identification requirements from Nov. 9 to Nov. 12.

The suit says Boockvar acted unilaterally and illegally in doing so and that the voter ID deadline must be rolled back to Nov. 9.

If voters with missing proof of identification information were not to provide that information to be processed by Nov. 9, then the ballot could be thrown out.

-ABC News' Matthew Mosk, Benjamin Siegel and Alex Hosenball

ABC News Chief Political Analyst Matthew Dowd said that he thinks Americans are as divided now as they were in the lead up to the Civil War.

"Well to me we're as divided as we were since 1860. I think that's where we are," he told ABC News Live Prime Anchor Linsey Davis. "As a country, because of how we people have lined up and where they are in this country and the level of frustration and anger in some instances and distrust to each side, that we're as divided as we've been in 160 years."

Dowd added that he thought Democrats should be concerned about the results of this election. 

"They're losing in places they used to win, they're not winning by as big margins as they used to do in blue areas," he said. "This is a divided country. They may end up winning the presidency in this instance and keeping the House, but this thing is on a razor edge in who's got the lead in the country today and it's exceedingly close in every election."

Democratic Michigan Sen. Gary Peters will win his Michigan Senate race, ABC News projects.

Peters has held the seat since 2014.

Peters defeated John James, a former Apache combat helicopter pilot in Iraq, who previously ran for the Senate in 2018. During the campaign Peters touted his accomplishments for Michigan and tied James to Trump, while James sought to portray Peters as too liberal for the Rust Belt state.