The FiveThirtyEight Politics Podcast crew takes a closer look at who exactly is voting in this election and how voters' preferences have changed or stayed the same since 2016.

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FiveThirtyEight Politics Podcast: How the electorate will be different in 2020

Supreme Court Justice Brent Kavanaugh made a rare, if minor, correction to a Supreme Court opinion in response to a highly public objection.

Earlier Wednesday, the state of Vermont formally requested that Kavanaugh correct his concurring opinion from Monday's controversial Supreme Court decision blocking a mail ballot deadline extension in Wisconsin.

While arguing that the court should not "second-guess" state legislative judgements during the pandemic, he attempted to draw a comparison between Wisconsin and other states which he claimed had decided against changes to mail ballot rules.

"States such as Vermont," Kavanaugh wrote, "have decided not to make changes to their ordinary election rules, including to the election-day deadline for receipt of absentee ballots. The variation in state responses reflects our constitutional system of federalism. Different state legislatures may make different choices."

While it's true that Vermont has not extended its Election Day postmark requirement for mail ballots, the state has in fact made substantive changes to the rules aimed at allowing greater participation during a public health crisis, including mailing every voter a ballot and prepaid return envelope.

Kavanaugh made a revision to page 5 of his opinion, the court clerk said later Wednesday. It has not changed the substantive bottom line of his vote.

With the revision, it now reads, "Other States such as Vermont, by contrast, have decided not to make changes to their ordinary election-deadline rules, including to the election-day deadline for receipt of absentee ballots. See, e.g., Vt. Stat. Ann., Tit. 17, §2543 (2020). The variation in state responses reflects our constitutional system of federalism."

-ABC News Senior Washington Reporter Devin Dwyer and Benjamin Siegel

After a surprisingly sluggish weekend for polling, the floodgates have opened, with a mix of high-quality polls, low-quality polls and pretty much everything in between. And although there are some outliers in both directions, they tell a fairly consistent story, overall: A steady race nationally, perhaps with some gains for Joe Biden in the Midwest.

As Biden was leaving The Queen Theater in Wilmington, Delaware, on Wednesday night, he as asked why he sometimes wears two masks.

"Because, the one mask is the N-95 and I don't like it around my ears and I hold it on with this mask," Biden said referencing how he sometimes sports a blue paper mask over his N-95 mask.

-ABC News' Molly Nagle

National Guardsmen will be called up in some states on Election Day as election workers or to facilitate the opening of polling places to help make up for shortfalls of poll workers as a result of the coronavirus pandemic.

Voters won't know that they are National Guardsmen, however because they're being called to active duty to serve as state government employees helping out on Election Day, so they won't be wearing uniforms or carrying weapons.

Behind the scenes, National Guard cyber units have helped with the security of state computer systems and will be able to help out state IT teams if there are issues on Election Day.

Wisconsin and Tennessee will have National Guardsmen helping out at polling centers. In Wisconsin they'll be working as poll workers and helping with cleaning and providing sanitary supplies to the locations. Guardsmen in Tennessee are not allowed to serve as poll workers, so they'll be facilitating the opening of polling centers.

Nebraska's Maj. Gen. Daryl Bohac reiterated that guardsmen helping out as poll workers will essentially be civilians and if there's a need for security assistance because of violence or a threat of violence, they'll be calling 911 for law enforcement assistance, just like any other civilian.

In Washington state, "the biggest thing they're looking at is potential intrusion into the system. So looking at firewalls, looking at the status of the Vote Washington system," said Brig. Gen. Gent Welsh, Washington's Assistant Adjutant General. "Looking for anomalies in the system, basically typical network hygiene that you would usually expect to see anywhere and in a company, or even in the military."

Washington state is a vote-by-mail state, so on Election Day, Welsh said five guardsmen will be part of the team ensuring that the tabulation of votes is safe. They've been there for the past month preparing for Election Day and they'll remain on duty for four to five days after that to ensure the system's security. Welsh said cyber teams first started working on assessing vulnerabilities to the state's systems. "Most all of it is done over the shoulder of the Secretary of State teams, their own IT staff, teach them how to do these things as well. But again, just another extra set of eyes," he said.

In Tennessee, 30 Guardsmen have been providing "subject matter expertise" ensuring the counties have a "very robust support system" as they upgrade their software and assist with "the basic protocols of insurance," said Maj. Gen. Jeff Holmes, Tennessee's adjutant general. He said that six or seven counties had asked for specific assistance.

Wisconsin's assistant adjutant general, Brig. Gen. Robyn Blader, also added that, "the extent of Wisconsin National Guard's role in the November election, is still being determined."

-ABC News' Luis Martinez