In the past 60 years, the number of competitive congressional elections has been declining, a trend called which of the following?

Question

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Vanishing marginals is the term used to describe the trend of decreasing competition in congressional elections. This trend is characterized by a growing number of safe seats, or districts where one party has a significant advantage over the other, making it difficult for the minority party to mount a serious challenge. This trend has resulted in a growing number of incumbents being reelected by large margins, reducing the number of competitive races.

In the Past 60 Years, the Number of Competitive Congressional