The Incumbent Reckoning examines the political forces behind the 2026 U.S. House primary upsets and what they reveal about changing voter attitudes toward established members of Congress. 

Across five focused chapters, Cello Jeremy explores why incumbency is no longer an automatic shield, how challengers are gaining momentum, what these contests reveal about divisions within both major political parties, and what the results could mean for the future of Congress. 

Written as a concise and accessible political analysis, the book looks beyond individual races to examine the broader pressures reshaping American electoral politics. Information and election developments discussed in this edition are current through August 9, 2026.