She carried a devoted Republican piece of the base. Many were McCain supporters and stood behind Haley during the primaries. They can make a difference in a swing state.The average voter outside of her state would barely know who she is other than she was a governor somewhere. I doubt most would even know she was in the primary against Trump. And her cable news presence has been minimal. It's not dislike, but indifference in her case.
And those moderate Trump haters are already voting for Harris. They are baked in. Being voters are not going to base their choice on her recommendation.

U.S elections: Who will Nikki Haley voters vote for - Trump or Harris? Suspense begins
As the 2024 U.S. presidential election draws near, a surprising divide is unfolding among Nikki Haley's supporters. A new focus group reveals that while some of these voters are reluctantly backing Donald Trump, others are considering an unusual pivot towards Vice President Kamala Harris or even...
Key Swing States Could be Affected
The focus group’s findings suggest that Haley’s former supporters in swing states could play a crucial role in the election. With a mix of decisions among them—some leaning toward Trump, others Harris, and a few opting for third-party candidates—the GOP and Democrats may find that swaying undecided voters in the final days of the campaign could tip the balance.
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