Haley and Trump face off soon in South Carolina. Here's what to know

South Carolina votes Saturday in the state's Republican primary, and former President Donald Trump is expected to defeat the state's former governor, Nikki Haley.

Haley is trying hard to overcome the odds, spending millions of dollars on the airwaves, dwarfing what Trump and his allies are spending.

But even if she loses, Haley says she's sticking around.

"South Carolina will vote on Saturday," Haley said in a speech this week. "But on Sunday, I'll still be running for president. I'm not going anywhere."

Her road will perhaps be even more daunting after South Carolina, but before looking beyond the Palmetto State, let's take a look at the keys to winning the state and how it all works.

How will it work?

The primary is locally run at the county level and ultimately certified by South Carolina's State Election Commission. Polls are open from 7 a.m. to 7 p.m. ET, and there are more than 2,000 polling precincts.

How many delegates are there?

Fifty — the most of any state so far. Still, after South Carolina's Republican primary, just 6% of the total number of delegates to the Republican National Convention will have been awarded. At this point, Trump leads Haley 63-17 in delegates. A candidate needs 1,215 to be the nominee.

How does the state award its delegates?

Winner-take-all by statewide vote and based on how a candidate finishes in the state's seven congressional districts.

What do the polls say?

There have been very few reliable polls ahead of the South Carolina primary, so any data should be taken with a grain of salt. That said, in an average of the polls, Trump leads by more than 30 percentage points.

What are the keys to winning?

There are four distinct political regions: the Lowcountry, Pee Dee, the Midlands and