The system for selecting party nominees does the passage describe is The Open Primary.
From the passage describe, a primary election in which voters are not required to be associated with a political party in order to vote for partisan candidates is an open primary. In a typical open primary, voters choose one party's ballot and cast a vote for that party's nomination.
A primary election (primary of nomination), or simply primary, is a vote in which voters within a jurisdiction choose the candidate that a political party will nominate for a subsequent general election.
In other words, it is a democratic method for picking the candidate a party will present in a particular election. Originating with the progressive movement, "Primaries" are far more prevalent in the United States, not just for presidential elections but also to select candidates for representatives, senators, mayors, and governors, among others.
Learn more about open primary election here:
brainly.com/question/4464739
#SPJ4