Final thought: Trump acting like the race is over might fuel Haley's hate fire
I agree with what Jacob said above. Trump's attempts to dismiss Haley might serve to make her more committed to staying in. There's one thing that Haley's right about: Most Americans are actually not that hyped about a rematch between Biden and Trump. They would like someone else to vote for, in theory. But it's often some theoretical, perfect candidate. Up until tonight, Republican primary voters, in polls or in real-life voting, haven't really settled on one of the many Trump challengers. It's possible the winds could change and Haley could win them going forward. But loyalty to Trump has become a litmus test for Republicans, and it's not clear how many of those voters actually exist and are ready to vote for Haley. But if Haley's committed to finding them, the primary might not be over.
—Monica Potts, 538