An unusually elevated number of Democratic House primary defeats this cycle—already totaling seven or more by mid-October—has driven trader consensus toward 10-12 incumbents ultimately losing their nominations. Progressive challengers, often younger and aligned with democratic socialist priorities, have defeated several long-serving moderates in states including New York, Colorado, Michigan, Texas, and Connecticut, fueled by internal party dissatisfaction, redistricting ripple effects, and a broader anti-incumbent mood. Record levels of contested Democratic primaries have amplified opportunities for such upsets. While the frontrunner outcome at 90.8% reflects this established pattern, additional late-cycle surprises in remaining contests or unexpected retirements could realistically push the total higher into the 13-15 range.