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Republicans are unified against Biden’s plans for health care, environmental protection and civil rights, but some fear that outgoing President Donald Trump’s brazen attempts to undermine the integrity of the nation’s voting systems may discourage voters in Georgia.

At a rally in northwest Georgia on the eve of Tuesday’s runoffs, Trump repeatedly declared that the November elections were plagued by fraud that Republican officials, including his former attorney general and Georgia’s elections chief, say did not occur. 

The president called Georgia’s Republican secretary of state “crazy” and vowed to help defeat him in two years. At the same time, Trump encouraged his supporters to show up in force for Georgia’s Tuesday contests.

“You’ve got to swarm it tomorrow,” Trump told thousands of cheering supporters, downplaying the threat of fraud.

Democrats must win both of the state’s Senate elections to gain the Senate majority. In that scenario, the Senate would be equally divided 50-50 with Vice President-elect Kamala Harris serving as the tie-breaker for Democrats.

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Democrats already secured a narrow House majority and the White House during November’s general election.

Even a closely divided Democratic Senate likely won’t guarantee Biden everything he wants, given Senate rules that require 60 votes to move most major legislation. But if Democrats lose even one of Tuesday’s contests, Biden would have little shot for swift up-or-down votes on his most ambitious plans to expand government-backed health care coverage, strengthen the middle class, address racial inequality and combat climate change. A Republican-controlled Senate also would create a rougher path for Biden’s Cabinet picks and judicial nominees.

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“Georgia, the whole nation is looking to you. The power is literally in your hands,” Biden charged at his own rally in Atlanta earlier Monday. “One state can chart the course, not just for the next four years, but for the next generation.”

Georgia’s January elections, necessary because no Senate candidates received a majority of the general-election votes, have been unique for many reasons, not least because the contenders essentially ran as teams, even campaigning together sometimes.

One contest features Democrat Raphael Warnock, who serves as the senior pastor of the Atlanta church where slain civil rights leader Martin Luther King Jr. grew up and preached. The 51-year-old Black man was raised in public housing and spent most of his adult life preaching in Baptist churches.

Warnock is facing Republican Sen. Kelly Loeffler, a 50-year-old former businesswoman who was appointed to the Senate less than a year ago by the state’s Republican governor. She is only the second woman to represent Georgia in the Senate, although race has emerged as a campaign focus far more than gender. Loeffler and her allies have seized on some snippets of Warnock’s sermons at the historic Black church to cast him as extreme. Dozens of religious and civil rights leaders have pushed back.

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The other election pits 71-year-old former business executive David Perdue, who held the Senate seat until his term officially expired on Sunday, against Democrat Jon Ossoff, a former congressional aide and journalist. At just 33 years old, Ossoff would be the Senate’s youngest member if elected. The fresh-faced Democrat first rose to national prominence in 2017 when he launched an unsuccessful House special election bid.

 Democrats have hammered Perdue and Loeffler, each among the Senate’s wealthiest members, for conspicuously timed personal stock trades after members of Congress received information about the public health and economic threats of COVID-19 as Trump and Republicans downplayed the pandemic. None of the trades has been found to violate the law or Senate ethics, but Warnock and Ossoff have used the moves to cast the Republicans as self-interested and out of touch.

Perdue and Loeffler have answered by lambasting the Democratic slate as certain to to usher in a leftward lunge in national policy. Neither Warnock nor Ossoff is a socialist, as Republicans allege. They do, however, support Biden’s agenda.

This week’s elections mark the formal finale to the turbulent 2020 election season more than two months after the rest of the nation finished voting. The stakes have drawn nearly $500 million in campaign spending to a once solidly Republican state that now finds itself as the nation’s premier battleground.

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“It’s really about whether an agenda that moves the nation forward can be forged without significant compromise,” said Martin Luther King III, the son of the civil rights icon and a Georgia native, who predicted “razor thin” margins on Tuesday. “There are a lot of things that are in the balance.”

The results also will help demonstrate whether the sweeping political coalition that fueled Biden’s victory was an anti-Trump anomaly or part of a new landscape.

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Biden won Georgia’s 16 electoral votes by about 12,000 votes out of 5 million cast in November.

Democratic success will likely depend on driving a huge turnout of African Americans, young voters, college-educated voters and women, all groups that helped Biden become the first Democratic presidential candidate since 1992 to win Georgia. Republicans, meanwhile, have been focused on energizing their own base of white men and voters beyond the core of metro Atlanta.

More than 3 million Georgians voted before Tuesday.

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The runoff elections come as Trump continues his unprecedented campaign to undermine election results across various states he lost. In a recording of a private phone call made public on Sunday, the president told Georgia’s secretary of state to “find” enough votes to give him an outright victory in the state, even after repeated recounts, failed court challenges, and state certification.

Campaigning in Georgia on Monday hours before Trump’s visit, Vice President Mike Pence said he has concerns about “voting irregularities.” He has also repeatedly described Georgia Republicans as “the last line of defense” against a Democratic takeover in Washington, an implicit acknowledgement that the Trump has indeed lost the election.

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Congress is scheduled to vote to certify Biden’s victory on Wednesday. In another affirmation of Trump’s hold on his fellow Republicans, Loeffler took the stage at Trump’s rally and vowed to join the small but growing number of Republicans protesting the count on the Senate floor.

“Look, this president fought for us,” she said. “We’re fighting for him.”