Answer: Why drop out now?
Elliott, I think that the window for her to drop out after losing tonight probably closes pretty soon. It's a long month between now and South Carolina, but Haley seems set on making it to her home state. If a loss tonight wasn't enough to push her out, I'm not sure what will change over the next few weeks to alter that calculus. She's got a big ad buy coming down the pike in South Carolina (which, of course, could be canceled) and talks up the state all the time.
To me, the more fun question is whether or not Haley seriously contests the actual next contest after New Hampshire, the US Virgin Islands caucus on February 8. The USVI had been on my radar because the GOP there will conduct its caucus using ranked-choice voting, which I believe is unique among Republican contests, but in a two-person race, ranked-choice is a little less interesting.
—Jacob Rubashkin, Inside Elections