Structural constitutional law regulates the workings of government and supplies the
rules of the political game. Whether by design or by accident, these rules sometimes
tilt the playing field for or against certain political factions—not just episodically,
based on who holds power at a given moment, but systematically over time—in
terms of electoral outcomes or policy objectives. In these instances, structural con-
stitutional law is itself structurally biased.
This Article identifies and begins to develop the concept of such structural biases,
with a focus on biases affecting the major political parties. Recent years have wit-
nessed a revival of political conflict over the basic terms of the U.S. constitutional
order. We suggest that this phenomenon, and a large part of structural constitu-
tional conflict in general, is best explained by the interaction between partisan
polarization and structural bias, each of which can intensify the other. The Article
also offers a typology of structural biases, keyed to the contemporary United States
but potentially applicable to any system. To date, legal scholars have lagged social
scientists in investigating the efficiency, distributional, and political effects of gov-
ernance arrangements. The concept of structural bias, we aim to show, can help
bridge this disciplinary gap and thereby advance the study of constitutional design
and constitutional politics.
