This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

(NEXSTAR) – Could the Democrats pack the courts or get rid of the Senate filibuster during a Biden Presidency? Those topics were heavily debated during the run-up to the 2020 Election, but they may prove moot – even if Biden wins – with more Democratic losses in the Senate.

Republicans trounced Democratic challengers in crucial states but failed to lock down the seats needed to retain their tenuous majority as of Thursday. In fact, a clear picture of Senate control may not come until 2021.

One race in Georgia is headed to a January runoff. A second contest in Georgia and races in North Carolina and Alaska remain undecided, leaving the chamber now deadlocked 48-48.

“We’re waiting — whether I’m going to be the majority leader or not,” Senate Majority Leader Mitch McConnell, R-Ky., said Wednesday.

If current leads in Alaska and North Carolina hold for Republicans, they will at least guarantee a 50-50 split. That scenario would allow the next vice president to serve as the tiebreaker on strictly partisan votes.

Republicans also lead the second race in Georgia, where GOP Sen. David Perdue was trying to hold off Democrat Jon Ossoff in a multi-candidate race that could also go to a runoff in January if neither candidate clears the 50% threshold to win.

There already is a Jan. 5 runoff in the state’s other Senate race. GOP Sen. Kelly Loeffler will face Democrat Raphael Warnock, a Black pastor at the church where the Rev. Martin Luther King Jr. preached, after they emerged as top vote-getters, but failed to clear the majority threshold.

That means we could be waiting until January to find out who controls the majority, and the possibility exists that the Democrats will be attempting to flip both Georgia seats in an attempt to pull even in the Senate.

Republican control in the Senate would split power, making it more difficult for Biden or Trump to pass significant legislation without winning bipartisan support.

In North Carolina, GOP Sen. Thom Tillis hoped to prevail over Democrat Cal Cunningham, whose sexting affair with a public relations specialist has clouded the race.

Republicans were confident they would keep Alaska, where GOP Sen. Dan Sullivan was challenged by Democratic newcomer Al Gross, a doctor.

Democrats faced long but not fully impossible odds to take a slim majority after a disappointing election night when Republicans defeated multiple challengers.

In Michigan, Democrats were spared a loss when Sen. Gary Peters withstood a strong challenge from Republican John James, a Black Republican businessman.

McConnell, who secured a seventh term for himself in a costly campaign against Democrat Amy McGrath, a former fighter pilot, has said he felt “pretty good” about the remaining contests.

But Democrats remained hopeful. Strategist Zac Petkanas said the 2020 election “was going to be an awful, ugly, dirty slog until the bitter end.”

Election night jarred Democrats and enthusiastic backers who were eager to counter Trump and his party’s grip on the Senate.

While Democrats picked up must-win seats in Colorado and Arizona, they suffered a setback in Alabama, and Republicans held their own in one race after another — in South Carolina, Iowa, Texas, Kansas and Montana. That dramatically limited Democrats’ hopes to make inroads.

In Maine, Sen. Susan Collins’ victory over Democrat Sara Gideon was especially important for Republicans, holding a seat in a state where Trump was not expected to win. For Collins, it was the hardest-fought race of her career. Democrats had tried to tie the moderate to Trump and criticized her for her vote to confirm Justice Brett Kavanaugh in 2018.

Many races attracted an unprecedented outpouring of small-dollar donations for Democrats.

“You wasted a lot of money,” said White House ally Sen. Lindsey Graham, R-S.C., after defeating Jamie Harrison, despite the Democrat’s stunning $100 million haul for his upstart campaign.

But Harrison energized voters, among several Black Democratic candidates for Senate including Warnock, drawing an outpouring of national support in a year of racial reckoning, enthusiasm that will be tested again in 2021.

“This is the most important race in the country right now,” Warnock said in a fundraising appeal.

Securing the Senate majority will be vital for the winner of the presidency. Senators confirm administration nominees, including the Cabinet, and can propel or stall the White House agenda. With Republicans now controlling the chamber, 53-47, three or four seats will determine party control, depending on who wins the presidency.

The Democrats’ gains were in Colorado where former Gov. John Hickenlooper defeated GOP Sen. Cory Gardner, and Arizona, where former astronaut Mark Kelly beat Republican incumbent Martha McSally.

But Democrats couldn’t hold on in Alabama: Former college football coach Tommy Tuberville defeated Sen. Doug Jones.

The Associated Press contributed to this report.