By 2020, the main threat to the reelection of most members of Congress came from:

Question

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Primary challenges from the more extreme elements within their own party have become a growing threat to incumbent members of Congress. This is due to the increasing political polarization and ideological divisions within parties, where moderate candidates may face challenges from more ideologically extreme opponents who are better able to mobilize party activists and donors. Additionally, primary challenges often require candidates to cater to a more ideologically pure base, which may lead to more extreme positions that may be less palatable to general election voters.

By 2020, the Main Threat to the Reelection of Most