The decrease in moderates winning primaries is due to more ideologically motivated primary voters, a decline in moderate numbers, and the emphasis on attracting committed partisans during primaries.
Fewer moderates have won primaries than they used to due to a combination of factors. One key reason is that primary voters have become more ideologically motivated than voters in general elections. This has led to a rise in politically inexperienced candidates running for office who may espouse extreme positions to stand out.
Additionally, the number of moderates has declined as both political parties have shifted towards ideological extremes, making it harder for moderate candidates to secure nominations.
The rise of the primary system and the emphasis on attracting committed partisans during primaries have also contributed to the decrease in moderate candidates winning primaries.
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