Efforts to reform the U.S. campaign finance system typically focus on the corrupting influence of large contributions. Yet, as Raymond J. La Raja and Brian F. Schaffner argue, reforms aimed at cutting the flow of money into politics have unintentionally favored candidates with extreme ideological agendas and, consequently, fostered political polarization.
Drawing on data from 50 states and the U.S. Congress over 20 years, La Raja and Schaffner...