That data is vote history: a person-by-person record of who voted and who did not. It offers a definitive account of the makeup of the electorate, and it will help answer some of the most important questions of the primary season.
At least here, it suggests that most Haley voters already supported Mr. Biden in 2020. It also implies that Mr. Biden's strength in the primaries is not inconsistent with polls showing him struggling among young and Black voters.
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