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United States presidential primary - Wikipedia
How the US Primary System Works - Voice of America
Primary election | Description, History, & Facts | Britannica
Primary election - Wikipedia
2024 US presidential primaries, explained - CNN
A brief history of presidential primaries | Constitution Center
How The Modern Primary System Has Shaped Our Politics
Primary election - Ballotpedia
Types of Primary Systems, Explained - Unite America
12.2 The Presidential Election Process - OpenStax