Most of the Senate seats up for grabs in the US midterm elections have been won, but the result for Georgia won't be known for weeks.
Incumbent Democrat Raphael Warnock and his Republican challenger Herschel Walker were neck and neck, with the state eventually announcing the contest would be decided in a runoff election.
Let's unpack what that means and why it could have big implications for the rest of the country.
What is a runoff election?
It's a second election with fewer candidates.
Under Georgia law, a candidate has to win at least 50 per cent of the vote to be declared the winner.
If no one gets 50 per cent, the election is run again, but this time only with the top two candidates.
When will Georgia's runoff election be held?
December 6.
Has it happened before?
Yes.
It'll be the second runoff for Mr Warnock, in fact.
He first won his seat in after a runoff in January 2021.
Why is it such a big deal?
Because it may determine whether the Republicans or the Democrats have the majority in the Senate.
The outcome of this vote won't change the fact that Joe Biden is president.
However, if Republicans held the majority in the Senate, it would make it much more difficult for him to get things done.
That would allow Republicans to block things like the president's nominees for judicial and administrative posts.
But the significance of this runoff really hinges on the Arizona and Nevada Senate election results.
As of Thursday afternoon AEDT, they were yet to be called.
Democrat Mark Kelly was leading in Arizona at 51.4 per cent, while Republican Adam Laxalt was leading in Nevada on 49.6 per cent.
Alaska is also yet to be called, but its two leading candidates are Republicans so that seat is decided from a national politics point of view.
How many seats do the Republicans need to win the Senate majority?
51.
There are 100 seats in the Senate and, prior to the midterms, it was a 50/50 split between Republicans and Democrats.
However, the Democrats controlled the Senate because Vice-President Kamala Harris had the power to cast a tie-breaking vote.
That means that if it's another 50/50 split, the Democrats will retain control.
Here's a live tracker of the Senate results, which is updated in real time:
ABC with Wires
