Defeat to Donald Trump looms over Nikki Haley. So why stay in the race?

Defeat to Donald Trump looms over Nikki Haley. So why stay in the race?
Why is Nikki Haley staying in the Primary Republican presidential candidate Nikki Haley says it's not "the end of our story" despite Donald Trump's easy primary victory in South Carolina, her home state where the onetime governor had long suggested her competitiveness with the former president would show.

Defying calls from South Carolina Republicans to exit the race, Haley traveled Sunday to Michigan, which holds its primary on Tuesday, speaking to a hotel ballroom packed with hundreds of supporters.