So about Nevada, the next state voting in the Republican race
Haley focused her speech on South Carolina's Feb. 24 primary. But that's not technically the next contest in the Republican presidential primary. The next Republican electoral event is actually Nevada's GOP primary on Feb. 6. However, the Nevada GOP opted against using the state-run primary and instead will use caucuses on Feb. 8 to allocate delegates to candidates. As a result, the Nevada primary is a kind of "beauty contest" — a vote with no bearing on delegate allocation.
But it gets a bit stranger from there. As part of the filing rules for the caucuses, the Nevada GOP required candidates to not enter the primary taking place two days earlier. Some candidates, including Trump, didn't file for the primary. But Haley, perhaps thinking Trump winning the caucuses was a sure thing, filed for the primary and not the caucuses. So now Haley is essentially unopposed in the primary — there are a few minor candidates and drop-outs like Tim Scott and Mike Pence — and Trump is unopposed in the caucuses. Will Haley be able to play up a win in Nevada? Unclear.
But it's also possible that pro-Trump Republicans could make a concerted effort to take advantage of Nevada's unusual "none of these candidates" ballot option. Encouraging Trump voters to cast a vote for none of the above could keep Haley from winning with a majority, should enough choose it. All of this may feel about as crazy as putting your life's savings on black at the roulette table. However, state parties can opt against using a state-run primary to allocate their delegates and instead use a party-run event like a caucus — there are many examples throughout the history of presidential nomination contests. It's just not usually something that happens in an early-voting state.
—Geoffrey Skelley, 538