Super Tuesday is the biggest day of voting in the US outside of the November election.
But what is it, what makes it super – and what will be different about this year?
What is Super Tuesday?
Super Tuesday is the day when the most US states choose who they think should be their candidates for president.
In fifteen states plus the US territory of American Samoa, Democrats and Republicans will say who they want to see on the ballot come November.
Super Tuesday – an unofficial name that has been used since at least 1976 – is also when the highest number of delegates will be awarded to candidates.
Although voters cast ballots for their preferred presidential candidates, it is the delegates to the national party conventions who ultimately select the presidential nominees for each major party.
That means candidates need to secure delegates, largely by winning in the primaries, to guarantee their path to the election.
More than a third of the total delegates available will be allotted on Super Tuesday.
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In the Republican contest, 874 of 2,429 delegates will be up for grabs, while the Democrats will award 1,420 delegates.
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What is Super Tuesday? Sky News explains
What is different about this Super Tuesday?
Super Tuesday is normally the moment “when candidates are whittled down from a pack to just a few”, US correspondent Mark Stone explains.
“This year, it’s not so super.”
That’s because the race is already dominated by clear front-runners in each party.
President Joe Biden is the presumptive Democratic candidate, and it is highly unlikely that will change.
Donald Trump has emerged as the firm favourite for the Republican Party.
But there are still a few “key moments to watch”, Stone says.
“Nikki Haley is Trump’s competition, she’s well behind in most polls and even lost her home state – but she is fighting on.
“If she pulls out, then this Super Tuesday will mark the unofficial crowning moment for Trump as the Republican candidate.
“Tuesday will be the moment to judge just how strong Donald Trump is and how electable he is in November.”
When will we know the results?
With so many states and a territory voting across different time zones, it could take a while for the full results to be clear.
Most polls close in the early evening, and results will start trickling in after that.
In California, postal ballots are valid as long as they are postmarked on or prior to primary election day and arrive by 12 March.
In addition, some states hold “open primaries” that allow registered voters to choose whether to cast their ballots in the Democratic or Republican primary, adding a possible layer of unpredictability.
Which states are voting?
Votes will be held in Alabama, Alaska, Arkansas, California, Colorado, Maine, Massachusetts, Minnesota, North Carolina, Oklahoma, Tennessee, Texas, Utah, Vermont, Virginia and the US territory of American Samoa.
Republicans will vote in all the states, but not American Samoa, which is holding its Republican caucus on 8 March.
Democrats will vote in all those places bar Alaska, where they will wait until 6 April to cast their ballot.
A man has been taken into custody two days after a US politician and her husband were shot dead in Minnesota, law enforcement officials have said.
Authorities had urged the public not to approach Vance Boelter, 57, who they warned could be armed, and who was reportedly posing as a police officer.
A massive manhunt was launched on Saturday after Melissa Hortman and Mark Hortman were shot dead at their home in Minneapolis in what Minnesota governor Tim Walz called a “politically motivated assassination”.
Police said the same gunman that killed the Hortmans had earlier shot and wounded Democrat senator John Hoffman and his wife, Yvette, at their home nine miles away.
Image: Representative Melissa Hortman and Senator John Hoffman. Pic: Facebook/Minnesota Legislature
Boelter was arrested on Sunday evening in a rural area in Sibley County, southwest of Minneapolis.
He faces two counts of second-degree murder and two counts of attempted second-degree murder in the deaths of the Hortmans and the wounding of Hoffman and his wife.
Image: The FBI released this image of Vance Boelter posing as a police officer. Pic: FBI.
Police said they responded to gunfire reports at the Hoffmans’ Champlin home shortly after 2am on Saturday and found them with multiple gunshot wounds.
They then checked on the Hortmans’ home, in the nearby Brooklyn Park suburb, and saw what appeared to be a police car and a man dressed as an officer leaving the front door.
“The individual immediately fired upon the officers, who exchanged gunfire, and the suspect retreated back into the home” and escaped on foot, said Brooklyn Park police chief Mark Bruley.
Authorities believe Boelter wore a mask as he posed as a police officer, and also used a vehicle resembling a squad car.
Several AK-style firearms and a list of about 70 names, which included politicians and abortion rights activists, were allegedly found inside the vehicle.
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Governor calls it ‘targeted political violence’
‘We are both incredibly lucky to be alive’
Senator Hoffman was shot nine times and is having multiple surgeries, according to a text message shared on Instagram by fellow senator Amy Klobuchar on Sunday.
The text from Yvette Hoffman added: “I took 8 and we are both incredibly lucky to be alive.”
She said her husband “is closer every hour to being out of the woods”.
Mrs Hortman used her position to champion protections around abortion rights, including laws to cement Minnesota’s status as a safe refuge for people from restrictive states, who travel there for an abortion.
Her work also sought to introduce protections for services that provide abortions.
A manhunt is continuing after the gunning down of a Democrat politician and her husband – with police saying they’re acting on the assumption he is still alive and dangerous.
Melissa Hortman and Mark Hortman were shot dead at home in a Minneapolis suburb on Saturday in what governor Tim Walz called a “politically motivated assassination”.
Democrat senator John Hoffman and his wife were also shot multiple times at their home nine miles away, but survived.
A search is under way for Vance Boelter, 57, who authorities believe wore a mask as he posed as a police officer, and also used a vehicle resembling a squad car.
Several AK-style firearms and a list of about 70 names, which included politicians and abortion rights activists, were found inside.
Image: Melissa Hortman and Senator John Hoffman. Pic: Facebook / Minnesota Legislature
Boelter was last caught on camera wearing a cowboy hat – a similar hat was found near another vehicle belonging to him on Sunday.
Authorities said at their latest news conference they assume he is still alive.
Hundreds of police officers are searching for Boelter, who escaped from the Hortmans’ house on foot after an exchange of gunfire.
Senator Hoffman was shot nine times and is having multiple surgeries, according to a text message shared on Instagram by fellow senator Amy Klobuchar on Sunday.
The text from Mr Hoffman’s wife, Yvette, added: “I took 8 and we are both incredibly lucky to be alive.”
She said her husband “is closer every hour to being out of the woods”.
“We believe [Boelter’s] somewhere in the vicinity and that they are going to find him,” Senator Klobuchar told NBC’s Meet the Press.
“Everyone’s on edge here,” she added, “because we know that this man will kill at a second.”
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Neighbours of killed US politician stunned
Police said they responded to gunfire reports at the Hoffmans’ Champlin home shortly after 2am on Saturday and found them with multiple gunshot wounds.
They then checked on the Hortmans’ home, in the nearby Brooklyn Park suburb, and saw what appeared to be a police car and a man dressed as an officer leaving the front door.
“The individual immediately fired upon the officers, who exchanged gunfire, and the suspect retreated back into the home” and escaped on foot, said Brooklyn Park police chief Mark Bruley.
Another vehicle belonging to Boelter was searched on Sunday in Minnesota’s Faxon Township. A cowboy hat similar to the one seen in the police appeal was found nearby.
It’s been revealed that the suspect texted friends around 6am on Saturday to say he had “made some choices” and was “going to be gone for a while”.
According to AP, which has seen the messages, he reportedly said: “May be dead shortly, so I just want to let you know I love you guys both and I wish it hadn’t gone this way… I’m sorry for all the trouble this has caused.”
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1:08
Governor calls it ‘targeted political violence’
Records show Boelter – a father of five – is a former political appointee who served on the same state workforce development board as Mr Hoffman.
However, it’s unclear to what extent they knew each other, if at all.
Mr Hoffman, 60, was first elected in 2012 and runs a consulting firm called Hoffman Strategic Advisors.
Melissa Hortman, a 55-year-old mother of two, was first elected in 2004 and was the top house Democratic leader in the state legislature.
She also served as speaker of the Minnesota House of Representatives.
Mrs Hortman used her position to champion protections around abortion rights, including laws to cement Minnesota’s status as a safe refuge for people from restrictive states, who travel there for an abortion.
Her work also sought to introduce protections for services that provide abortions.
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Neighbours of killed US politician stunned
Friends of Ms Hortman have told Sky News that her two children feared for their mother’s life after reading divisive rhetoric directed at her online.
Matt Norris, another political colleague of Ms Hortman, was also at church, reflecting on the rise of political violence in America.
Image: Matt Norris
“We’ve going to have to do some serious introspection as a state, as a country, and figure out how do we get beyond this,” he said.
“How have we been laying the seeds that have led to horrific acts of violence against public servants like this?
“And it’s going to be incumbent upon us as leaders to set a different tone, to set a different direction for our state and our country so that horrific tragedies like this never occur again.”
Image: Tributes left for Melissa Hortman and her husband outside the Minnesota State Capitol
But there’s no sign of division at the State Capitol Building, where flags fly at half-mast and flowers are being left in tribute.
This is a community united in grief and in its hope for an end to gun violence in America.