Over the last few months, Nikki Haley has gained enough in the polls to suggest she is on the verge of surpassing Ron DeSantis as the main threat to Donald J. Trump in the race to become the Republican candidate for 2024. Jazmine Ulloa, a national politics reporter for The Times; and Nate Cohn, The Times’s chief political analyst, discuss her building momentum and examine how far she might go.