Texas has shattered its voting record with four days to go until Nov. 3, reporting 9,009,850 votes already cast as of this morning, beating the state's all-time record of 8,969,226 votes cast in 2016.

In a final push to encourage early voting, Harris County, the state's most populous county which includes Houston and the surrounding area, kept eight locations open for 24 hours. The 24-hour period started Thursday morning. Between 7 p.m. Thursday and 7 a.m. Friday, 10,250 people voted there.

Harris County Clerk Chris Hollins announced during a drive-in concert late Thursday that the county -- home to roughly 4.7 million people -- had surpassed its entire voter turnout from 2016 with nearly 1.4 million votes already cast.

Friday is the final day Texans can vote early in the 2020 election. It comes as California Sen. Kamala Harris takes to the GOP-stronghold for the day as Democrats sense an opportunity -- though a long shot -- to win the state's 38 electoral votes.

-ABC News' Bonnie Mclean

Heading into the final weekend before Election Day, both candidates are doing a final blitz through the battleground states they hope will determine the outcome of the race in their favor -- but the barnstorming comes as coronavirus cases rise in every competitive state they’re vying for.

Friday brings the candidates to Minnesota and Wisconsin -- revealing the importance both campaigns are placing on those states. Trump also stops in Michigan -- where Biden will campaign on Saturday with former President Barack Obama -- and Biden will also take to Iowa -- a state he hasn’t seen since the Iowa caucuses and one that Trump took in 2016 by nearly 10 points.

Trump’s and Biden’s campaign events in the homestretch have also illustrated their different outlooks on the coronavirus pandemic, with Trump insisting to packed crowds of mostly maskless supporters that the virus is disappearing, while Biden has acknowledged the pandemic will continue even if he’s elected and has repeatedly thanked his supporters for wearing masks and social distancing at his drive-in rallies. 

But Trump’s rally in Minnesota this afternoon may change that trend and force the president to face the realities of the pandemic.

In the first time the campaign has limited attendance at a rally in accordance with local COVID-19 guidelines, the Trump campaign will allow just the first 250 people in line to attend Trump's rally in Rochester, Minnesota, due to restrictions by the governor to control the virus, which the campaign called "free speech-stifling."

The weekend blitz comes after the candidates converged in Florida Thursday to court the Latino vote and in which each offered conflicting realities of COVID-19 at their dueling rallies down the I-4 corridor. The weather threw both of them curve balls by the evening with Biden’s second Florida rally being cut short due to rain and Trump’s North Carolina rally also scrapped due to weather.

The vice president and vice-presidential candidate, too, are out of the trail with Republicans on offense -- defending the map that led them to victory in 2016 -- and Democrats seeking to expand theirs.

California Sen. Kamala Harris travels in Texas as Democrats play offense and sense an opportunity to snatch the GOP-stronghold for the first time in more than four decades. Vice President Mike Pence, meanwhile, has two rallies in Arizona -- a state Trump won in 2016 by four points.

With just four days to go and more than 82 million votes already cast, time is running out for Trump and Biden to sway voters.

Biden’s campaign has announced that he will be spending at least part of the last 72 hours in the 2020 race in the Pennsylvania -- an indication of just how important Democrats believe the Keystone State will be in determining a winner.

On Sunday, Biden will travel to Philadelphia to “discuss bringing Americans together to address the crises facing the country and win the battle for the soul of the nation.”

On Monday, Biden and former second lady Jill Biden, along with Sen. Kamala Harris and her husband Doug Emhoff plan to "barnstorm" the state, spreading out across all the four corners.

Biden’s speech on Sunday offers a bit of a full circle moment for for the former vice president, who held his "campaign launch rally" in Philadelphia on May 18, 2019, and laid out his campaign vision for unifying the country in the remarks just under a month after launching his third run for president.

Pennsylvania is by far the state Biden has visited the most in the 2020 general election and one that holds a particular importance to him.

"I'm going to win Pennsylvania. It's a matter of a great deal to me, personally as well as politically," Biden told reporters Monday.

Trump will take to Pennsylvania Saturday for three rallies, and he’s still planning to barnstorm nearly a dozen events in the final 48 hours across states he carried in 2016.

FiveThirtyEight currently places Pennsylvania as the likeliest "tipping-point state" in its forecast or the state that could determine the winner of the Electoral College.

-ABC News' Molly Nagle

It's happening the way it's supposed to happen. Voters are voting -- smashing records, adjusting behaviors and recalibrating expectations -- in ways that show the nation is many things, but definitely not apathetic.

It's also happening in ways that will stress the systems built to account for it all. More early votes, oddly, will mean reporting out results will take longer in several critical states -- to say nothing of the continuing challenges of participating in and administering an election in the midst of a pandemic.

Amid a flurry of COVID-era campaigning in battleground states, this week brought new high-water marks that suggest turnout records will fall this year.

Nearly as many Texans have voted as in all of 2016, with Georgia, North Carolina, Florida and Arizona are among the states already three-quarters of the way there, according to the United States Elections Project at the University of Florida.

But this week also brought continued uncertainties about the process of voting. The Supreme Court now has nine justices again, and voters in states, including Wisconsin, Michigan, Pennsylvania, Minnesota and North Carolina have a right to be confused about what the law is when it comes to how to vote -- and even what those laws might be on Election Day and beyond.

Layered on top of all of that are the efforts by President Trump to sow doubts about the integrity of the election.

From the local level on up, election officials say they're confident that there will be an accurate -- and, hopefully, promptly tallied -- vote count. But the surge of voting, while good for democracy, figures to make everything more difficult during this most difficult of times for the country.

-ABC News’ Political Director Rick Klein