Georgia voters braved the winter chill and turned out en masse at polling stations Tuesday to vote in one of the most consequential and expensive elections in US history.

The eyes of the nation are trained on Georgia for two hugely impactful runoff races that will determine which party controls the Senate and whether incoming President-elect Joe Biden will have any congressional check against his left-leaning agenda.

More than 3 million voters cast their ballots early — or approximately 40 percent of registered voters in the state — while hundreds of thousands of other Georgians were expected to turn out, and many of them did so at the crack of dawn in long lines at polling stations.

GOP Sens. David Perdue and Kelly Loeffler are squaring off against Democratic challengers Jon Ossoff and Rev. Raphael Warnock in elections that will determine whether Biden will be able to push through tax hikes, the Green New Deal and another revamp of ObamaCare.

At an election eve rally in Dalton, Ga., President Trump implored Georgians to cast their ballots and warned that they would be at the mercy of Biden, House Speaker Nancy Pelosi (D-Calif.) and Senate Minority Leader Chuck Schumer (D-NY), who would become majority leader under Democratic control of the Senate.

“If these two [incumbents] don’t win, and if we don’t take the presidency, you have a country that will be run by Schumer, Pelosi and Biden,” Trump said.

“The people of Georgia will be at the mercy of the left-wing socialists, Communists, Marxists, and that’s where it’s going. You know we don’t like to use the word Communist,” he went on.

If Democrats win both seats, the body will be split 50-50, meaning Vice President Kamala Harris, as Senate president, will have the tie-breaking vote.

Lines were long but moving smoothly Tuesday with wait times of less than one minute, according to Peach State election officials.

Still, given the enormous turnout and huge volume of mail-in ballots, which cannot be counted until polls close at 7 p.m., the races may not be called for days.

Reports emerged on Tuesday afternoon of voters experiencing problems with electronic voting machines in majority-GOP counties, echoing similar Election Day allegations of corrupted machines that were amplified in a tweet from the president.

Georgia election official Gabriel Sterling said there had been a “programming error” on some machines and poll worker cards in counties like Columbia. Sterling said law enforcement were taking newly programmed keys and cards to polling sites while voting continued on “backup emergency ballots.”

“[T]his issue in Columbia Co. was resolved hours ago and our office informed the public about it in real time. The voters of everyone will be protected and counted,” he wrote.

Trump’s re-election campaign had previously claimed that Dominion Voting Systems worked in cahoots with Democrats to flip votes from Biden to Trump, costing him a second term.

On Monday, the company’s CEO announced he intended to sue former Trump campaign lawyer Sidney Powell for defamation over her claims about the machines.

The Georgia runoff races have become among the most expensive in US history with Republican control of the upper chamber in the balance.

The four candidates, political parties, super PACs and outside groups have generated $486 million in campaign ads in the two-month leadup to Tuesday’s vote, according to Axios’ analysis of the spending totals compiled by Ad Impact.

Biden’s political team also reportedly dropped at least $18 million on the effort, including staff, fundraising, and data support, Reuters reported on Tuesday.

Warnock, a senior pastor at the historic Ebenezer Baptist Church where Dr. Martin Luther King Jr. once preached, is taking on Loeffler.

Ossoff, a 33-year-old investigative journalist who would become the youngest senator in 40 years, is challenging Perdue.

The rematch was triggered when none of the candidates reached the required 50 percent of the vote in November. Perdue led Ossoff 49.7 percent to 48 percent.

Polls suggest that Tuesday’s runoff will be another nail-biter. As of Monday evening, Ossoff led Perdue 49.3 percent to 48.5 percent, according to a RealClearPolitics average of polling, while Warnock led Loeffler 49.8 percent to 48 percent.

A record-shattering amount of money was raised by the Democratic challengers in the last two months, reflecting the gravity of the race.

Ossoff and Warnock became the best-funded Senate candidates in history when donors coughed-up over $200 million for their campaigns — eclipsing the previous record held by former Democratic Senate candidate Jaime Harrison, who raised what was then considered an astonishing $57 million in the final quarter of his failed race against Sen. Lindsey Graham (R-SC).

Georgia has been ground zero in the 2020 election fight since November Joe Biden narrowly carried the state by less than 12,000 ballots — becoming the first Democratic presidential candidate to do so since Bill Clinton triumphed over George H. W. Bush there in 1992.

A machine recount and a hand recount took several weeks but only cemented Biden’s victory over Trump in the Peach State.

At his Dalton rally on Tuesday evening, Trump told supporters there was “no way” he lost once reliably-red Georgia.

“I ran two elections. I won both of them, the second one much more successful than the first,” he said.

A political maelstrom is now brewing in Washington as Congress prepares to meet on Wednesday to confirm Biden’s electoral college victory.

As many as three dozen Congressional Republicans have announced they will object to the former veep’s win and call for an emergency audit to review allegations of fraud.