What to know about the upcoming New Hampshire primary

With Iowa's caucuses in the rearview mirror, New Hampshire's primary is up next.

With 22 GOP delegates at stake, campaigns are making their way through New Hampshire before the Jan. 23 primary — with their sights set on the state's undecided voters.

As the first-in-the-nation presidential primary election approaches, here is what to know.

New Hampshire will be a major test for former U.N. Ambassador Nikki Haley and Florida Gov. Ron DeSantis after they finished far behind former President Donald Trump in the Iowa caucuses. As with Iowa, Trump is the front-runner in New Hampshire, according to 538's recent polling averages in the state.

Undeclared voters — also known as independent voters — will be a main focus in the New Hampshire primary. With more undeclared voters than those registered as Republican or Democrats, their votes will be valuable in the state's open primary. In 2024, more than 100 of those undeclared voters will opt to cast ballots in the competitive Republican contest.

Of the remaining GOP presidential hopefuls, Haley has spent the most time in New Hampshire with 49 events spread over 35 days in the state. Behind her is DeSantis who has done 40 events over 18 days in New Hampshire. Trump has done the fewest events with 12 events spread over 10 days in the state.

President Joe Biden will not be on the ballot in New Hampshire. According to the Democratic National Committee rules, he is prohibited from competing. After months of refusing to come into compliance with DNC calendar guidelines, Biden's campaign wrote in a letter to New Hampshire Democrats in October informing them that the president would not be filing in their primary.

Democrat challengers, such as Dean Phillips and Marianne Williamson, have campaigned