Campaign finance laws may be making political polarization worse by encouraging ‘purist’ donors.

Many Americans have become increasingly concerned over the role of money in politics, and back more populist approaches to reducing political donations. Raymond J. La Raja and Brian F. Schaffner, authors of Campaign Finance and Political Polarization: When Purists Prevail, argue that populist approaches such as imposing low contribution limits on parties, distort the campaign finance system in ways that benefit a small group of partisan purists at the expense of the broader electorate. This in turn pushes candidates towards ideological extremes. They write that reformers should consider a more...