Answer :
Final answer:
The increased level of party polarization in the United States places incumbent moderates at the greatest risk of losing a primary election.
Explanation:
The increased level of party polarization in the United States has led to a greater risk for incumbent moderates in losing primary elections.
As parties become more polarized, they tend to nominate candidates who align closely with the party's base. Incumbent moderates may face challenges from more extreme candidates who are seen as more representative of the party's values.
Incumbent conservatives and liberals who closely align with the party's base are less likely to face significant risks in primary elections due to their strong party support.
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