MILWAUKEE, Wis. — Vice President Kamala Harris and former President Trump held competing rallies at the same Friday night, just a few miles apart in battleground Wisconsin's largest city.

With just four days until Election Day, the Democratic and Republican presidential nominees made their final stops in Wisconsin, where nearly all the latest public opinion polls indicate a margin-of-error race between the two candidates.

"We got four days to get this thing done. Four days. No one can sit on the sidelines," the vice president emphasized to her supporters. "For you who have not yet voted, no judgment, but please get to it when you can."

In order to carry Wisconsin, Harris needs to run up the score in Milwaukee and its surrounding suburbs in order to make up for the expected red-wave in the state's rural counties.

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Kamala Harris walking on stage

Democratic presidential nominee Vice President Kamala Harris arrives to speak during a campaign rally at the Wisconsin State Fair Expo in West Allis, Wis., Friday, Nov. 1, 2024. (AP Photo/Jacquelyn Martin) (AP Photo/Jacquelyn Martin)

The Harris campaign said that over 12,000 packed into the Wisconsin State Fair Park Exposition Center, in West Allis, just yards outside the Milwaukee city limits.

Trump, holding court at Milwaukee's Fiserv Forum - the same arena where he accepted his party's presidential nomination during the Republican National Convention in July - told his supporters "I want your damn vote."

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Speaking ahead of Harris at her rally was popular rapper and songwriter Cardi B, who told the crowd she hadn't planned on voting in the presidential election until Harris replaced President Biden in July atop the Democrats' 2024 ticket.

"I wasn’t going to vote this year. … But Kamala Harris joining the race, she changed my mind completely," the entertainer said.

former President Trump on stage at rally

Republican presidential nominee former President Donald Trump speaks at a campaign rally Friday, Nov. 1, 2024, in Milwaukee. (AP Photo/Morry Gash) (AP Photo/Morry Gash)

The rallies were Harris and Trump's final appearances in Wisconsin ahead of Election Day - and it was the second time this week that the major party nominees held rallies on the same day in Wisconsin.

"As of this weekend, the way to predict the winner is to flip a coin. It’s that close," University of Wisconsin-Milwaukee professor emeritus Mordecai Lee told Fox News.

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The Democratic and Republican Parties' vice presidential nominees — Minnesota Gov. Tim Walz and Sen. JD Vance of Ohio, respectively — have also both crisscrossed Wisconsin, and major surrogates — including former Presidents Obama and Clinton for Harris — have parachuted into the Badger State. Obama returns on Sunday.

Both campaigns and their aligned committees and super PACs have also flooded Wisconsin airwaves with TV ads in the closing stretch leading up to Election Day next week.

crowd shot of Milwaukee Harris-Walz rally

Vice President Kamala Harris, the Democratic presidential nominee, holds her final rally in Wisconsin ahead of Election Day, in Milwaukee on Nov. 1, 2024 (Fox News - Paul Steinhauser)

Wisconsin, along with Michigan and Pennsylvania, are the three Rust Belt states that make up the Democrats' so-called "blue wall."

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Democrats reliably won all three states for a quarter-century before Trump narrowly captured them in the 2016 election over Democratic Party nominee Hillary Clinton to win the White House.

Four years later, in 2020, President Biden swept all three states by razor-thin margins to put them back in the Democrats' column and defeat Trump. In Wisconsin, Biden carried the state by just over 20,000 votes out of more than 3.2 million cast.

Get the latest updates from the 2024 campaign trail, exclusive interviews and more at our Fox News Digital election hub.