Public involvement in the electoral process has all but disappeared. Not since World War I has even half the electorate cast ballots in an off-year election. Even at the presidential level, voting has plummeted dismally. Nonvoting is, quite simply, systemic in American politics.

It was not always this way. With the integration of America's mass electorate into the electoral system in the 1830s, eligible voters were intensely participatory and remained highly mobilized throughout the nineteenth century. The turning point in American politics came during the first two decades of this...