Photo: Luke Sharrett/Bloomberg via Getty Images
As the US wakes up to Super Tuesday - March 1 - it's curtains up on one of the most significant day on the US presidential election calendar.
It's a day when13 different states and territories will be voting to select their preferred presidential candidates.
Both Republican and Democratic party voters can significantly swing the race one way or the other by the time this night is over. The sheer number of delegates on offer makes this a do-or-die date for most candidates neck deep in the race.
Just what's going on today? Our handy explainer will help bring you up to speed with all the buzz about Super Tuesday.
What is Super Tuesday?
A dozen states and one territory are holding their primaries on this day
The states holding their primaries today are - Alabama, Alaska Republican Caucus, American Samoa, Arkansas, Colorado, Georgia, Massachusetts, Minnesota, Oklahoma, Tennessee, Texas, Vermont, Virginia and Democrats Abroad
History of Super Tuesday
Another reason is because the Southern Democrats wanted to highlight the electoral significance of their region. They would do this by clubbing a group of states together on a single day of voting
When do polls close?
In India, Super Tuesday will actually fall Wednesday early morning, with the first polls closing 5.30 am Indian time. Here's the state-wise schedule (all in US Eastern Standard Time):
How many delegates are on offer?
865 Democratic delegates
States to watch:
Who are the candidates vying for the delegates
Republicans (a total of 1,237 delegates are needed to win the party nomination):
Marco Rubio: 16 delegates
Ben Carson: 4 delegates
Democrats (2,383 delegates to win):
Favoured to win:
The only state where Trump isn't favoured to win is Texas. There, Ted Cruz has a 9 point lead going into Super Tuesday.
If either emerges as a decisive runner-up, they could pressurise the other to drop out to give the Republican Party a better chance at stopping Trump.
Clinton leads in Alabama (38 points), Arkansas (29 points), Georgia (35 points), Tennessee (26 points), Texas (28 points), and Virginia (20 points)
Who might drop out of the race?
Trump's rise is a matter of serious concern within his party. But thar doesn't mean they see his nomination as a done deal. According to Politico, "No matter what happens on Tuesday, Cruz and Rubio's allies point out, Trump will be nowhere close to securing the 1,237 delegates needed to secure the GOP nomination. The 595 delegates up for grabs will be distributed proportionately, meaning that Cruz and Rubio are expected to rack up a substantial number even if they do not succeed in winning many states. Going into Super Tuesday, Trump has won 82 of the 133 delegates that have been awarded so far."
Read more: Trump closes in on Super Tuesday romp
When are the next primaries after Super Tuesday?
Democrats will also be voting in the Nebraska Caucus
Democrats vote in Florida, Illinois, Missouri, North Carolina and Ohio with a total delegate offering of 792
Watch this space for how Super Tuesday plays out - and what the implications of the results are!