But as political scientist Jonathan A. Rodden demonstrates in Why Cities Lose, the left's electoral challenges have deeper roots in economic and political geography.In the late nineteenth century, support for the left began to cluster in cities among the industrial working class. Today, left-wing parties have become coalitions of diverse urban interest groups, from racial minorities to the creative class. These parties win big in urban districts but struggle to capture the suburban and rural seats necessary for legislative majorities. A bold new interpretation of today's urban-rural political conflict, Why Cities Lose also points to electoral reforms that could address the left's under-representation while reducing urban-rural polarization.