Misinformation and conspiracy theories swirling around the 2020 presidential race are reaching an "alarming" number of Latino voters in Florida through Spanish language social media sites, advocacy groups and elected officials said.

The experts voiced concern that the barrage of misleading messages about Biden and the coronavirus, often containing right-wing conspiracy theories, could swing the vote in the state, where Latinos account for 17% of registered voters, according to a Pew Research Center analysis of Florida state government data.

Advocates pointed to Republicans and Trump as some of the sources of disinformation flooding Latinos' social media feeds, but the full picture regarding the origins of the information was not immediately clear.

-ABC News' Laura Romero

Harris underwent testing for COVID-19 today and tested negative, a Harris aide said.

The Biden-Harris campaign has announced the results of the candidates' COVID-19 tests since Trump tested positive for COVID-19 earlier this month.

Harris, who turns 56 today, has a virtual rally this afternoon to kick off the first day of voting in Wisconsin.

-ABC News' Averi Harper

As early voting officially kicks off in Wisconsin, the state has already seen about four times more absentee ballots cast and five times as many ballots requested as compared with this time last year -- and the start of early in-person voting today is likely to bring in another big wave of voters.

Early voting schedules are different in every municipality, but it runs from today through Oct. 30. It's technically early absentee in-person: Voters receive an absentee ballot in their clerks' office, fill it out and hand it back to the clerks.

This morning, just before early in-person voting began, over 1.4 million ballots had been requested and 915,965 returned.

Some voters in Milwaukee queued up in long lines waiting to enter their polling sites.

-ABC News' Cheyenne Haslett

A photo is circulating on Twitter depicting a City of Miami police officer wearing a pro-Trump mask inside a polling site. The chair of the Miami-Dade Democratic Party, Steve Simeonidis, took the photo and posted it but ABC News could not confirm the officer's name.

Miami Police issued a statement referencing "the photograph being circulated," noting that "this behavior is unacceptable, a violation of departmental policy, and is being addressed immediately." A public information officer with the department, Mike Vega, told ABC News by phone that the chief of police will take "immediate action."

Vega said that donning political clothing or accessories is "a violation of our departmental orders," and Simeonidis told the Miami Herald he considered the officer's behavior "voter intimidation."

A spokeswoman for the Miami-Dade County elections office told ABC News that a complaint about the incident was brought to her attention this morning. She then passed it on to Miami Police.

-ABC News' Will McDuffie

With just two weeks until voters cast their final ballots, former Vice President Joe Biden’s campaign is launching a new ad, “I Can’t,” focused on a small business owner in Arizona -- a state the former vice president is hoping to turn blue on Election Day.

“I can’t do another four years of this. I—I can’t,” Maggie, a hair salon co-owner from Phoenix, Arizona, says in the ad. ”There’s never been more divisiveness in this country. It’s frightening and sad.”

In her testimonial, Maggie takes aim at Trump on his signature issue of the economy, particularly amid the COVID-19 pandemic.

“That was Trump’s whole thing, you know -- take the politics out of it and run it like one of his businesses. I know people were looking for that kind of change, but it’s not working,” she said.

“We’ve only gotten more in debt, we have this virus now out of control, people out of work, no healthcare. How is that helping people?” Maggie continued, echoing arguments Biden has taken up against Trump on the trail.

The ad continues similar messaging from another recent ad from Biden’s team, focused on a bar and music venue owner in Michigan hurting from the coronavirus outbreak, and comes one day after the president held two rallies in Arizona, a state he carried by nearly four points in 2016.

However, recent Arizona state polling shows Trump now trailing Biden significantly in the state the former vice president’s team has identified as an expansion opportunity in their path to 270 electoral votes.

The ad is slated to run nationally during cable programming, as well as in key battleground states, including Arizona, Florida, Georgia, Iowa, Michigan, Minnesota, Nebraska, Nevada, New Hampshire, North Carolina, Ohio, Pennsylvania and Wisconsin.

In the final two weeks until Election Day, the Biden campaign, the Democratic National Committee and pro-Biden outside groups are slated to outspend Trump and pro-Trump efforts on Television and radio ads.

According to ad spending data from media research firm CMAG, Biden and pro-Biden groups have reserved a total of $147 million in airtime from Tuesday through Nov. 3.

-ABC News’ Molly Nagle